212020131221 has 4 divisors (see below), whose sum is σ = 212021139744. Its totient is φ = 212019122700.

The previous prime is 212020131217. The next prime is 212020131251. The reversal of 212020131221 is 122131020212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212020131221 - 2² = 212020131217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212020131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020131251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56225 + ... + 653606.

It is an arithmetic number, because the mean of its divisors is an integer number (53005284936).

Almost surely, 2^212020131221 is an apocalyptic number.

It is an amenable number.

212020131221 is a deficient number, since it is larger than the sum of its proper divisors (1008523).

212020131221 is an equidigital number, since it uses as much as digits as its factorization.

212020131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008522.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212020131221 its reverse (122131020212), we get a palindrome (334151151433).

The spelling of 212020131221 in words is "two hundred twelve billion, twenty million, one hundred thirty-one thousand, two hundred twenty-one".