212021122111220 has 24 divisors (see below), whose sum is σ = 447818023241064. Its totient is φ = 84318226595456.

The previous prime is 212021122111217. The next prime is 212021122111229. The reversal of 212021122111220 is 22111221120212.

It can be written as a sum of positive squares in 4 ways, for example, as 20994833968144 + 191026288143076 = 4582012^2 + 13821226^2 .

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 = 212021122111192 and 212021122111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021122111229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30638887019 + ... + 30638893938.

It is an arithmetic number, because the mean of its divisors is an integer number (18659084301711).

Almost surely, 2^{212021122111220} is an apocalyptic number.

212021122111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021122111220 is an abundant number, since it is smaller than the sum of its proper divisors (235796901129844).

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

212021122111220 is a wasteful number, since it uses less digits than its factorization.

212021122111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61277781139 (or 61277781137 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212021122111220 its reverse (22111221120212), we get a palindrome (234132343231432).

The spelling of 212021122111220 in words is "two hundred twelve trillion, twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty".