21112110310020 has 48 divisors (see below), whose sum is σ = 59127848252928. Its totient is φ = 5628568522240.

The previous prime is 21112110309889. The next prime is 21112110310079. The reversal of 21112110310020 is 2001301121112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41229684 + ... + 41738603.

It is an arithmetic number, because the mean of its divisors is an integer number (1231830171936).

Almost surely, 2^{21112110310020} is an apocalyptic number.

21112110310020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112110310020 is an abundant number, since it is smaller than the sum of its proper divisors (38015737942908).

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

21112110310020 is a wasteful number, since it uses less digits than its factorization.

21112110310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82972540 (or 82972538 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21112110310020 its reverse (2001301121112), we get a palindrome (23113411431132).

The spelling of 21112110310020 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, three hundred ten thousand, twenty".