21870542253 has 72 divisors (see below), whose sum is σ = 35510872320. Its totient is φ = 11925688320.

The previous prime is 21870542231. The next prime is 21870542311. The reversal of 21870542253 is 35224507812.

It is not a de Polignac number, because 21870542253 - 2⁹ = 21870541741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21870542453) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28439853 + ... + 28440621.

It is an arithmetic number, because the mean of its divisors is an integer number (493206560).

Almost surely, 2^21870542253 is an apocalyptic number.

It is an amenable number.

21870542253 is a deficient number, since it is larger than the sum of its proper divisors (13640330067).

21870542253 is an equidigital number, since it uses as much as digits as its factorization.

21870542253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 21870542253 in words is "twenty-one billion, eight hundred seventy million, five hundred forty-two thousand, two hundred fifty-three".