21121010012102 has 64 divisors (see below), whose sum is σ = 42540981041664. Its totient is φ = 7595331517440.

The previous prime is 21121010012083. The next prime is 21121010012149. The reversal of 21121010012102 is 20121001012112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23802518 + ... + 24673910.

It is an arithmetic number, because the mean of its divisors is an integer number (664702828776).

Almost surely, 2^{21121010012102} is an apocalyptic number.

21121010012102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121010012102 is an abundant number, since it is smaller than the sum of its proper divisors (21419971029562).

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

21121010012102 is a wasteful number, since it uses less digits than its factorization.

21121010012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883533.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121010012102 its reverse (20121001012112), we get a palindrome (41242011024214).

The spelling of 21121010012102 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, twelve thousand, one hundred two".