21870663175 has 12 divisors (see below), whose sum is σ = 27147697456. Its totient is φ = 17478417600.

The previous prime is 21870663151. The next prime is 21870663181. The reversal of 21870663175 is 57136607812.

It is not a de Polignac number, because 21870663175 - 2³³ = 13280728583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428166 + ... + 476515.

Almost surely, 2^21870663175 is an apocalyptic number.

21870663175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21870663175 is a deficient number, since it is larger than the sum of its proper divisors (5277034281).

21870663175 is an equidigital number, since it uses as much as digits as its factorization.

21870663175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905658 (or 905653 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 21870663175 in words is "twenty-one billion, eight hundred seventy million, six hundred sixty-three thousand, one hundred seventy-five".