21121313102 has 16 divisors (see below), whose sum is σ = 33352544400. Its totient is φ = 10003901760.

The previous prime is 21121313099. The next prime is 21121313117. The reversal of 21121313102 is 20131312112.

It is a super-2 number, since 2×21121313102² (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 7 ways as a sum of consecutive naturals, for example, 560924 + ... + 597392.

It is an arithmetic number, because the mean of its divisors is an integer number (2084534025).

Almost surely, 2^21121313102 is an apocalyptic number.

21121313102 is a deficient number, since it is larger than the sum of its proper divisors (12231231298).

21121313102 is a wasteful number, since it uses less digits than its factorization.

21121313102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51731.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21121313102 its reverse (20131312112), we get a palindrome (41252625214).

The spelling of 21121313102 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirteen thousand, one hundred two".