21457901175 has 48 divisors (see below), whose sum is σ = 38020185600. Its totient is φ = 10650752640.

The previous prime is 21457901149. The next prime is 21457901207. The reversal of 21457901175 is 57110975412.

It is not a de Polignac number, because 21457901175 - 2¹² = 21457897079 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104275 + ... + 231924.

It is an arithmetic number, because the mean of its divisors is an integer number (792087200).

Almost surely, 2^21457901175 is an apocalyptic number.

21457901175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21457901175 is a deficient number, since it is larger than the sum of its proper divisors (16562284425).

21457901175 is a wasteful number, since it uses less digits than its factorization.

21457901175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336272 (or 336267 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 42.

The spelling of 21457901175 in words is "twenty-one billion, four hundred fifty-seven million, nine hundred one thousand, one hundred seventy-five".