21112210122020 has 48 divisors (see below), whose sum is σ = 47106055044720. Its totient is φ = 7948126126592.

The previous prime is 21112210121941. The next prime is 21112210122043. The reversal of 21112210122020 is 2022101221112.

It can be written as a sum of positive squares in 8 ways, for example, as 689710318144 + 20422499803876 = 830488^2 + 4519126^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21112210122020.

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, 107332079 + ... + 107528598.

It is an arithmetic number, because the mean of its divisors is an integer number (981376146765).

Almost surely, 2^{21112210122020} is an apocalyptic number.

21112210122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112210122020 is an abundant number, since it is smaller than the sum of its proper divisors (25993844922700).

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

21112210122020 is a wasteful number, since it uses less digits than its factorization.

21112210122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214860737 (or 214860701 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112210122020 its reverse (2022101221112), we get a palindrome (23134311343132).

The spelling of 21112210122020 in words is "twenty-one trillion, one hundred twelve billion, two hundred ten million, one hundred twenty-two thousand, twenty".