21627381253 has 4 divisors (see below), whose sum is σ = 21629396620. Its totient is φ = 21625365888.

The previous prime is 21627381247. The next prime is 21627381287. The reversal of 21627381253 is 35218372612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14654797249 + 6972584004 = 121057^2 + 83502^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21627381253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21627385253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991500 + ... + 1013077.

It is an arithmetic number, because the mean of its divisors is an integer number (5407349155).

Almost surely, 2^21627381253 is an apocalyptic number.

It is an amenable number.

21627381253 is a deficient number, since it is larger than the sum of its proper divisors (2015367).

21627381253 is a wasteful number, since it uses less digits than its factorization.

21627381253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015366.

The product of its digits is 120960, while the sum is 40.

The spelling of 21627381253 in words is "twenty-one billion, six hundred twenty-seven million, three hundred eighty-one thousand, two hundred fifty-three".