22220000020021 has 4 divisors (see below), whose sum is σ = 22220182825344. Its totient is φ = 22219817214700.

The previous prime is 22220000019991. The next prime is 22220000020027. The reversal of 22220000020021 is 12002000002222.

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 22220000020021 - 2¹³ = 22220000011829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22220000019983 and 22220000020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220000020027) 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, 91220215 + ... + 91463476.

It is an arithmetic number, because the mean of its divisors is an integer number (5555045706336).

Almost surely, 2^{22220000020021} is an apocalyptic number.

It is an amenable number.

22220000020021 is a deficient number, since it is larger than the sum of its proper divisors (182805323).

22220000020021 is a wasteful number, since it uses less digits than its factorization.

22220000020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182805322.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 22220000020021 its reverse (12002000002222), we get a palindrome (34222000022243).

The spelling of 22220000020021 in words is "twenty-two trillion, two hundred twenty billion, twenty thousand, twenty-one".