21401512175 has 12 divisors (see below), whose sum is σ = 26541931416. Its totient is φ = 17118592800.

The previous prime is 21401512123. The next prime is 21401512189. The reversal of 21401512175 is 57121510412.

It is not a de Polignac number, because 21401512175 - 2⁸ = 21401511919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110705 + ... + 234645.

It is an arithmetic number, because the mean of its divisors is an integer number (2211827618).

Almost surely, 2^21401512175 is an apocalyptic number.

21401512175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21401512175 is a deficient number, since it is larger than the sum of its proper divisors (5140419241).

21401512175 is a wasteful number, since it uses less digits than its factorization.

21401512175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130858 (or 130853 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The spelling of 21401512175 in words is "twenty-one billion, four hundred one million, five hundred twelve thousand, one hundred seventy-five".