21653300131231 has 2 divisors, whose sum is σ = 21653300131232. Its totient is φ = 21653300131230.

The previous prime is 21653300131223. The next prime is 21653300131249. The reversal of 21653300131231 is 13213100335612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21653300131231 - 2³ = 21653300131223 is a prime.

It is a super-2 number, since 2×21653300131231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21653300131193 and 21653300131202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21653300131831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826650065615 + 10826650065616.

It is an arithmetic number, because the mean of its divisors is an integer number (10826650065616).

Almost surely, 2^{21653300131231} is an apocalyptic number.

21653300131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653300131231 is an equidigital number, since it uses as much as digits as its factorization.

21653300131231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 21653300131231 its reverse (13213100335612), we get a palindrome (34866400466843).

The spelling of 21653300131231 in words is "twenty-one trillion, six hundred fifty-three billion, three hundred million, one hundred thirty-one thousand, two hundred thirty-one".