21300000220031 has 4 divisors (see below), whose sum is σ = 22938461775432. Its totient is φ = 19661538664632.

The previous prime is 21300000220013. The next prime is 21300000220043. The reversal of 21300000220031 is 13002200000312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21300000220031 - 2¹⁰ = 21300000219007 is a prime.

It is a super-2 number, since 2×21300000220031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300000219988 and 21300000220015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300000226031) 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, 819230777681 + ... + 819230777706.

It is an arithmetic number, because the mean of its divisors is an integer number (5734615443858).

Almost surely, 2^{21300000220031} is an apocalyptic number.

21300000220031 is a deficient number, since it is larger than the sum of its proper divisors (1638461555401).

21300000220031 is a wasteful number, since it uses less digits than its factorization.

21300000220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638461555400.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21300000220031 its reverse (13002200000312), we get a palindrome (34302200220343).

The spelling of 21300000220031 in words is "twenty-one trillion, three hundred billion, two hundred twenty thousand, thirty-one".