21200000101021 has 32 divisors (see below), whose sum is σ = 25397568258048. Its totient is φ = 17301918522240.

The previous prime is 21200000101013. The next prime is 21200000101051. The reversal of 21200000101021 is 12010100000212.

It is a cyclic number.

It is not a de Polignac number, because 21200000101021 - 2³ = 21200000101013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200000100989 and 21200000101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200000101051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 624228481 + ... + 624262441.

It is an arithmetic number, because the mean of its divisors is an integer number (793674008064).

Almost surely, 2^{21200000101021} is an apocalyptic number.

It is an amenable number.

21200000101021 is a deficient number, since it is larger than the sum of its proper divisors (4197568157027).

21200000101021 is a wasteful number, since it uses less digits than its factorization.

21200000101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51601.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200000101021 its reverse (12010100000212), we get a palindrome (33210100101233).

The spelling of 21200000101021 in words is "twenty-one trillion, two hundred billion, one hundred one thousand, twenty-one".