21010222000021 has 4 divisors (see below), whose sum is σ = 21023528032000. Its totient is φ = 20996915968044.

The previous prime is 21010222000013. The next prime is 21010222000051. The reversal of 21010222000021 is 12000022201012.

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 21010222000021 - 2³ = 21010222000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010221999965 and 21010222000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010222000051) 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, 6653013621 + ... + 6653016778.

It is an arithmetic number, because the mean of its divisors is an integer number (5255882008000).

Almost surely, 2^{21010222000021} is an apocalyptic number.

It is an amenable number.

21010222000021 is a deficient number, since it is larger than the sum of its proper divisors (13306031979).

21010222000021 is a wasteful number, since it uses less digits than its factorization.

21010222000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13306031978.

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

Adding to 21010222000021 its reverse (12000022201012), we get a palindrome (33010244201033).

The spelling of 21010222000021 in words is "twenty-one trillion, ten billion, two hundred twenty-two million, twenty-one", and thus it is an aban number.