21121310102 has 48 divisors (see below), whose sum is σ = 34958360160. Its totient is φ = 9557409792.

The previous prime is 21121310087. The next prime is 21121310141. The reversal of 21121310102 is 20101312112.

It is a super-2 number, since 2×21121310102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4305383 + ... + 4310285.

It is an arithmetic number, because the mean of its divisors is an integer number (728299170).

Almost surely, 2^21121310102 is an apocalyptic number.

21121310102 is a deficient number, since it is larger than the sum of its proper divisors (13837050058).

21121310102 is a wasteful number, since it uses less digits than its factorization.

21121310102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225 (or 5208 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21121310102 its reverse (20101312112), we get a palindrome (41222622214).

The spelling of 21121310102 in words is "twenty-one billion, one hundred twenty-one million, three hundred ten thousand, one hundred two".