202221000120021 has 4 divisors (see below), whose sum is σ = 269628000160032. Its totient is φ = 134814000080012.

The previous prime is 202221000119987. The next prime is 202221000120071. The reversal of 202221000120021 is 120021000122202.

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 202221000120021 - 2¹⁴ = 202221000103637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221000120071) 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, 33703500020001 + ... + 33703500020006.

It is an arithmetic number, because the mean of its divisors is an integer number (67407000040008).

Almost surely, 2^{202221000120021} is an apocalyptic number.

It is an amenable number.

202221000120021 is a deficient number, since it is larger than the sum of its proper divisors (67407000040011).

202221000120021 is an equidigital number, since it uses as much as digits as its factorization.

202221000120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67407000040010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202221000120021 its reverse (120021000122202), we get a palindrome (322242000242223).

The spelling of 202221000120021 in words is "two hundred two trillion, two hundred twenty-one billion, one hundred twenty thousand, twenty-one".