21367272653 has 2 divisors, whose sum is σ = 21367272654. Its totient is φ = 21367272652.

The previous prime is 21367272637. The next prime is 21367272733. The reversal of 21367272653 is 35627276312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19554386569 + 1812886084 = 139837^2 + 42578^2 .

It is a cyclic number.

It is not a de Polignac number, because 21367272653 - 2⁴ = 21367272637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21367272623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683636326 + 10683636327.

It is an arithmetic number, because the mean of its divisors is an integer number (10683636327).

Almost surely, 2^21367272653 is an apocalyptic number.

It is an amenable number.

21367272653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21367272653 is an equidigital number, since it uses as much as digits as its factorization.

21367272653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 44.

The spelling of 21367272653 in words is "twenty-one billion, three hundred sixty-seven million, two hundred seventy-two thousand, six hundred fifty-three".