22221100202021 has 16 divisors (see below), whose sum is σ = 25468181958528. Its totient is φ = 18992181120000.

The previous prime is 22221100202017. The next prime is 22221100202023. The reversal of 22221100202021 is 12020200112222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22221100202021 - 2² = 22221100202017 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 (22221100202023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110231921 + ... + 110433321.

It is an arithmetic number, because the mean of its divisors is an integer number (1591761372408).

Almost surely, 2^{22221100202021} is an apocalyptic number.

It is an amenable number.

22221100202021 is a deficient number, since it is larger than the sum of its proper divisors (3247081756507).

22221100202021 is a wasteful number, since it uses less digits than its factorization.

22221100202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246412.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221100202021 its reverse (12020200112222), we get a palindrome (34241300314243).

The spelling of 22221100202021 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred million, two hundred two thousand, twenty-one".