22221022210021 has 4 divisors (see below), whose sum is σ = 22221043892032. Its totient is φ = 22221000528012.

The previous prime is 22221022209979. The next prime is 22221022210067. The reversal of 22221022210021 is 12001222012222.

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 a de Polignac number, because none of the positive numbers 2^k-22221022210021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221022216021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9223245 + ... + 11380258.

It is an arithmetic number, because the mean of its divisors is an integer number (5555260973008).

Almost surely, 2^{22221022210021} is an apocalyptic number.

It is an amenable number.

22221022210021 is a deficient number, since it is larger than the sum of its proper divisors (21682011).

22221022210021 is a wasteful number, since it uses less digits than its factorization.

22221022210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21682010.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22221022210021 its reverse (12001222012222), we get a palindrome (34222244222243).

The spelling of 22221022210021 in words is "twenty-two trillion, two hundred twenty-one billion, twenty-two million, two hundred ten thousand, twenty-one".