212021220220020 has 72 divisors (see below), whose sum is σ = 643191196808160. Its totient is φ = 56533703079360.

The previous prime is 212021220220001. The next prime is 212021220220049. The reversal of 212021220220020 is 20022022120212.

212021220220020 is a `hidden beast` number, since 2 + 1 + 202 + 1 + 220 + 220 + 0 + 20 = 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 = 212021220219975 and 212021220220002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53163810 + ... + 57012569.

It is an arithmetic number, because the mean of its divisors is an integer number (8933211066780).

Almost surely, 2^{212021220220020} is an apocalyptic number.

212021220220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021220220020 is an abundant number, since it is smaller than the sum of its proper divisors (431169976588140).

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

212021220220020 is a wasteful number, since it uses less digits than its factorization.

212021220220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110187085 (or 110187080 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212021220220020 its reverse (20022022120212), we get a palindrome (232043242340232).

The spelling of 212021220220020 in words is "two hundred twelve trillion, twenty-one billion, two hundred twenty million, two hundred twenty thousand, twenty".