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21202022111 = 101209921011
BaseRepresentation
bin10011101111101111…
…010010111011011111
32000201121100022121012
4103233233102323133
5321410204201421
613423504525435
71350256133354
oct235757227337
960647308535
1021202022111
118a9aa97026
12413862087b
131ccb72961a
141051bc062b
1584155595b
hex4efbd2edf

21202022111 has 4 divisors (see below), whose sum is σ = 21411943224. Its totient is φ = 20992101000.

The previous prime is 21202022071. The next prime is 21202022117. The reversal of 21202022111 is 11122020212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21202022111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202022117) 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, 104960405 + ... + 104960606.

It is an arithmetic number, because the mean of its divisors is an integer number (5352985806).

Almost surely, 221202022111 is an apocalyptic number.

21202022111 is a deficient number, since it is larger than the sum of its proper divisors (209921113).

21202022111 is a wasteful number, since it uses less digits than its factorization.

21202022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209921112.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202022111 its reverse (11122020212), we get a palindrome (32324042323).

The spelling of 21202022111 in words is "twenty-one billion, two hundred two million, twenty-two thousand, one hundred eleven".

Divisors: 1 101 209921011 21202022111