22121221000021 has 16 divisors (see below), whose sum is σ = 26005237614720. Its totient is φ = 18551355030720.

The previous prime is 22121221000019. The next prime is 22121221000079. The reversal of 22121221000021 is 12000012212122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22121221000021 - 2¹ = 22121221000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121220999959 and 22121221000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121221000721) 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 15 ways as a sum of consecutive naturals, for example, 49390230 + ... + 49836103.

It is an arithmetic number, because the mean of its divisors is an integer number (1625327350920).

Almost surely, 2^{22121221000021} is an apocalyptic number.

It is an amenable number.

22121221000021 is a deficient number, since it is larger than the sum of its proper divisors (3884016614699).

22121221000021 is a wasteful number, since it uses less digits than its factorization.

22121221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99227916.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121221000021 its reverse (12000012212122), we get a palindrome (34121233212143).

The spelling of 22121221000021 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.