21121202102 has 64 divisors (see below), whose sum is σ = 42684171264. Its totient is φ = 7569901440.

The previous prime is 21121202057. The next prime is 21121202107. The reversal of 21121202102 is 20120212112.

It is a super-2 number, since 2×21121202102² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121202107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 568583 + ... + 604589.

It is an arithmetic number, because the mean of its divisors is an integer number (666940176).

Almost surely, 2^21121202102 is an apocalyptic number.

21121202102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121202102 is an abundant number, since it is smaller than the sum of its proper divisors (21562969162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121202102 is a wasteful number, since it uses less digits than its factorization.

21121202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36333.

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

Adding to 21121202102 its reverse (20120212112), we get a palindrome (41241414214).

The spelling of 21121202102 in words is "twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred two".