21022112212020 has 72 divisors (see below), whose sum is σ = 63852897902976. Its totient is φ = 5598351605952.

The previous prime is 21022112212019. The next prime is 21022112212039. The reversal of 21022112212020 is 2021221122012.

It is a happy number.

21022112212020 is a `hidden beast` number, since 21 + 0 + 221 + 1 + 221 + 202 + 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 = 21022112211984 and 21022112212002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78459472 + ... + 78726951.

It is an arithmetic number, because the mean of its divisors is an integer number (886845804208).

Almost surely, 2^{21022112212020} is an apocalyptic number.

21022112212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022112212020 is an abundant number, since it is smaller than the sum of its proper divisors (42830785690956).

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

21022112212020 is a wasteful number, since it uses less digits than its factorization.

21022112212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157187181 (or 157187176 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022112212020 its reverse (2021221122012), we get a palindrome (23043333334032).

The spelling of 21022112212020 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, two hundred twelve thousand, twenty".