21222010000021 has 16 divisors (see below), whose sum is σ = 22561523987904. Its totient is φ = 19892786877184.

The previous prime is 21222009999989. The next prime is 21222010000031. The reversal of 21222010000021 is 12000001022212.

It is a happy number.

It is not a de Polignac number, because 21222010000021 - 2⁵ = 21222009999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222009999956 and 21222010000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222010000031) 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, 1665186 + ... + 6724348.

It is an arithmetic number, because the mean of its divisors is an integer number (1410095249244).

Almost surely, 2^{21222010000021} is an apocalyptic number.

It is an amenable number.

21222010000021 is a deficient number, since it is larger than the sum of its proper divisors (1339513987883).

21222010000021 is a wasteful number, since it uses less digits than its factorization.

21222010000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5060180.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21222010000021 its reverse (12000001022212), we get a palindrome (33222011022233).

The spelling of 21222010000021 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, twenty-one", and thus it is an aban number.