21200310021 has 8 divisors (see below), whose sum is σ = 30836814624. Its totient is φ = 12848672720.

The previous prime is 21200310011. The next prime is 21200310023. The reversal of 21200310021 is 12001300212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200310021 - 2¹⁴ = 21200293637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200309979 and 21200310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200310023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321216786 + ... + 321216851.

It is an arithmetic number, because the mean of its divisors is an integer number (3854601828).

Almost surely, 2^21200310021 is an apocalyptic number.

It is an amenable number.

21200310021 is a deficient number, since it is larger than the sum of its proper divisors (9636504603).

21200310021 is a wasteful number, since it uses less digits than its factorization.

21200310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642433651.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21200310021 its reverse (12001300212), we get a palindrome (33201610233).

The spelling of 21200310021 in words is "twenty-one billion, two hundred million, three hundred ten thousand, twenty-one".