202212020021 has 4 divisors (see below), whose sum is σ = 220594930944. Its totient is φ = 183829109100.

The previous prime is 202212019981. The next prime is 202212020027. The reversal of 202212020021 is 120020212202.

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.

It is a cyclic number.

It is not a de Polignac number, because 202212020021 - 2¹⁰ = 202212018997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202212019978 and 202212020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202212020027) 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, 9191455445 + ... + 9191455466.

It is an arithmetic number, because the mean of its divisors is an integer number (55148732736).

Almost surely, 2^202212020021 is an apocalyptic number.

It is an amenable number.

202212020021 is a deficient number, since it is larger than the sum of its proper divisors (18382910923).

202212020021 is a wasteful number, since it uses less digits than its factorization.

202212020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18382910922.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202212020021 its reverse (120020212202), we get a palindrome (322232232223).

The spelling of 202212020021 in words is "two hundred two billion, two hundred twelve million, twenty thousand, twenty-one".