21300021131 has 2 divisors, whose sum is σ = 21300021132. Its totient is φ = 21300021130.

The previous prime is 21300021101. The next prime is 21300021137. The reversal of 21300021131 is 13112000312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300021131 is a prime.

It is a super-2 number, since 2×21300021131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21300021137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650010565 + 10650010566.

It is an arithmetic number, because the mean of its divisors is an integer number (10650010566).

Almost surely, 2^21300021131 is an apocalyptic number.

21300021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300021131 is an equidigital number, since it uses as much as digits as its factorization.

21300021131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21300021131 its reverse (13112000312), we get a palindrome (34412021443).

The spelling of 21300021131 in words is "twenty-one billion, three hundred million, twenty-one thousand, one hundred thirty-one".