21367566253 has 8 divisors (see below), whose sum is σ = 23356420416. Its totient is φ = 19386436800.

The previous prime is 21367566247. The next prime is 21367566257. The reversal of 21367566253 is 35266576312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21367566253 - 2⁹ = 21367565741 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 (21367566257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1925388 + ... + 1936453.

It is an arithmetic number, because the mean of its divisors is an integer number (2919552552).

Almost surely, 2^21367566253 is an apocalyptic number.

It is an amenable number.

21367566253 is a deficient number, since it is larger than the sum of its proper divisors (1988854163).

21367566253 is a wasteful number, since it uses less digits than its factorization.

21367566253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862355.

The product of its digits is 1360800, while the sum is 46.

The spelling of 21367566253 in words is "twenty-one billion, three hundred sixty-seven million, five hundred sixty-six thousand, two hundred fifty-three".