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1212220001 = 3139103871
BaseRepresentation
bin100100001000001…
…0000001001100001
310010111000011020002
41020100100021201
54440312020001
6320142025345
742016462046
oct11020201141
93114004202
101212220001
115722a2913
12299b78255
131641b2655
14b6dd11cd
157165146b
hex48410261

1212220001 has 4 divisors (see below), whose sum is σ = 1251323904. Its totient is φ = 1173116100.

The previous prime is 1212219989. The next prime is 1212220033. The reversal of 1212220001 is 1000222121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1212220001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212220091) 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, 19551905 + ... + 19551966.

It is an arithmetic number, because the mean of its divisors is an integer number (312830976).

Almost surely, 21212220001 is an apocalyptic number.

It is an amenable number.

1212220001 is a deficient number, since it is larger than the sum of its proper divisors (39103903).

1212220001 is an equidigital number, since it uses as much as digits as its factorization.

1212220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39103902.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1212220001 is about 34816.9499094909. The cubic root of 1212220001 is about 1066.2535295351.

Adding to 1212220001 its reverse (1000222121), we get a palindrome (2212442122).

It can be divided in two parts, 12122 and 20001, that added together give a palindrome (32123).

The spelling of 1212220001 in words is "one billion, two hundred twelve million, two hundred twenty thousand, one".

Divisors: 1 31 39103871 1212220001