22222121000021 has 4 divisors (see below), whose sum is σ = 22222326505344. Its totient is φ = 22221915494700.

The previous prime is 22222121000017. The next prime is 22222121000033. The reversal of 22222121000021 is 12000012122222.

It is a happy number.

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 22222121000021 - 2² = 22222121000017 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 (22222121000041) 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, 102590375 + ... + 102806756.

It is an arithmetic number, because the mean of its divisors is an integer number (5555581626336).

Almost surely, 2^{22222121000021} is an apocalyptic number.

It is an amenable number.

22222121000021 is a deficient number, since it is larger than the sum of its proper divisors (205505323).

22222121000021 is a wasteful number, since it uses less digits than its factorization.

22222121000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205505322.

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

Adding to 22222121000021 its reverse (12000012122222), we get a palindrome (34222133122243).

The spelling of 22222121000021 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.