21222111000021 has 16 divisors (see below), whose sum is σ = 28323588427200. Its totient is φ = 14134358124288.

The previous prime is 21222110999993. The next prime is 21222111000107. The reversal of 21222111000021 is 12000011122212.

It is not a de Polignac number, because 21222111000021 - 2²⁵ = 21222077445589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222111002021) 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, 19145515 + ... + 20223623.

It is an arithmetic number, because the mean of its divisors is an integer number (1770224276700).

Almost surely, 2^{21222111000021} is an apocalyptic number.

It is an amenable number.

21222111000021 is a deficient number, since it is larger than the sum of its proper divisors (7101477427179).

21222111000021 is a wasteful number, since it uses less digits than its factorization.

21222111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084468.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222111000021 its reverse (12000011122212), we get a palindrome (33222122122233).

The spelling of 21222111000021 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty-one", and thus it is an aban number.