21274674653 has 2 divisors, whose sum is σ = 21274674654. Its totient is φ = 21274674652.

The previous prime is 21274674613. The next prime is 21274674683. The reversal of 21274674653 is 35647647212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14047464484 + 7227210169 = 118522^2 + 85013^2 .

It is a cyclic number.

It is not a de Polignac number, because 21274674653 - 2⁸ = 21274674397 is a prime.

It is a super-2 number, since 2×21274674653² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21274674598 and 21274674607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21274674613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637337326 + 10637337327.

It is an arithmetic number, because the mean of its divisors is an integer number (10637337327).

Almost surely, 2^21274674653 is an apocalyptic number.

It is an amenable number.

21274674653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274674653 is an equidigital number, since it uses as much as digits as its factorization.

21274674653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 47.

The spelling of 21274674653 in words is "twenty-one billion, two hundred seventy-four million, six hundred seventy-four thousand, six hundred fifty-three".