Search a number
-
+
221212222001 = 2053107750717
BaseRepresentation
bin1100111000000101000…
…1101010001000110001
3210010222122211012201022
43032001101222020301
512111020312101001
6245342401345225
721660562601561
oct3160121521061
9703878735638
10221212222001
11858a7594591
1236a57638215
1317b24baa324
14a9c7398da1
155b4a84211b
hex338146a231

221212222001 has 4 divisors (see below), whose sum is σ = 221319974772. Its totient is φ = 221104469232.

The previous prime is 221212221991. The next prime is 221212222039. The reversal of 221212222001 is 100222212122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100222212122 = 250111106061.

It can be written as a sum of positive squares in 2 ways, for example, as 153604421776 + 67607800225 = 391924^2 + 260015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-221212222001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221212222201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53873306 + ... + 53877411.

It is an arithmetic number, because the mean of its divisors is an integer number (55329993693).

Almost surely, 2221212222001 is an apocalyptic number.

It is an amenable number.

221212222001 is a deficient number, since it is larger than the sum of its proper divisors (107752771).

221212222001 is a wasteful number, since it uses less digits than its factorization.

221212222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107752770.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221212222001 its reverse (100222212122), we get a palindrome (321434434123).

The spelling of 221212222001 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, one".

Divisors: 1 2053 107750717 221212222001