21112221112020 has 48 divisors (see below), whose sum is σ = 65682465683520. Its totient is φ = 5629925629728.

The previous prime is 21112221112013. The next prime is 21112221112033. The reversal of 21112221112020 is 2021112221112.

21112221112020 is a `hidden beast` number, since 211 + 122 + 211 + 120 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21112221111984 and 21112221112002.

It is a congruent number.

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, 19548352342 + ... + 19548353421.

It is an arithmetic number, because the mean of its divisors is an integer number (1368384701740).

Almost surely, 2^{21112221112020} is an apocalyptic number.

21112221112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221112020 is an abundant number, since it is smaller than the sum of its proper divisors (44570244571500).

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

21112221112020 is a wasteful number, since it uses less digits than its factorization.

21112221112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39096705781 (or 39096705773 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112221112020 its reverse (2021112221112), we get a palindrome (23133333333132).

The spelling of 21112221112020 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twelve thousand, twenty".