21300022031 has 2 divisors, whose sum is σ = 21300022032. Its totient is φ = 21300022030.

The previous prime is 21300022001. The next prime is 21300022049. The reversal of 21300022031 is 13022000312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300022031 - 2²⁶ = 21232913167 is a prime.

It is a super-2 number, since 2×21300022031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21300021997 and 21300022015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300022001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650011015 + 10650011016.

It is an arithmetic number, because the mean of its divisors is an integer number (10650011016).

Almost surely, 2^21300022031 is an apocalyptic number.

21300022031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300022031 is an equidigital number, since it uses as much as digits as its factorization.

21300022031 is an evil number, because the sum of its binary digits is even.

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

Adding to 21300022031 its reverse (13022000312), we get a palindrome (34322022343).

The spelling of 21300022031 in words is "twenty-one billion, three hundred million, twenty-two thousand, thirty-one".