21102020112 has 20 divisors (see below), whose sum is σ = 54513552080. Its totient is φ = 7034006688.

The previous prime is 21102020101. The next prime is 21102020123.

21102020112 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21102020101) and next prime (21102020123).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219812662 + ... + 219812757.

It is an arithmetic number, because the mean of its divisors is an integer number (2725677604).

Almost surely, 2^21102020112 is an apocalyptic number.

It is an amenable number.

21102020112 is an abundant number, since it is smaller than the sum of its proper divisors (33411531968).

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

21102020112 is a wasteful number, since it uses less digits than its factorization.

21102020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439625430 (or 439625424 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

It can be divided in two parts, 211020 and 20112, that added together give a palindrome (231132).

The spelling of 21102020112 in words is "twenty-one billion, one hundred two million, twenty thousand, one hundred twelve".