21112031023220 has 48 divisors (see below), whose sum is σ = 45543679644288. Its totient is φ = 8214740115840.

The previous prime is 21112031023219. The next prime is 21112031023277. The reversal of 21112031023220 is 2232013021112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21112031023192 and 21112031023201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135425 + ... + 6499415.

It is an arithmetic number, because the mean of its divisors is an integer number (948826659256).

Almost surely, 2^{21112031023220} is an apocalyptic number.

21112031023220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112031023220 is an abundant number, since it is smaller than the sum of its proper divisors (24431648621068).

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

21112031023220 is a wasteful number, since it uses less digits than its factorization.

21112031023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368520 (or 6368518 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21112031023220 its reverse (2232013021112), we get a palindrome (23344044044332).

The spelling of 21112031023220 in words is "twenty-one trillion, one hundred twelve billion, thirty-one million, twenty-three thousand, two hundred twenty".