21403151235657 has 12 divisors (see below), whose sum is σ = 30918752429760. Its totient is φ = 14267341551768.

The previous prime is 21403151235637. The next prime is 21403151235659. The reversal of 21403151235657 is 75653215130412.

21403151235657 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 31 + 51 + 2 + 3 + 565 + 7 = 666.

It is not a de Polignac number, because 21403151235657 - 2¹⁴ = 21403151219273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403151235659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118733157 + ... + 118913282.

It is an arithmetic number, because the mean of its divisors is an integer number (2576562702480).

Almost surely, 2^{21403151235657} is an apocalyptic number.

It is an amenable number.

21403151235657 is a deficient number, since it is larger than the sum of its proper divisors (9515601194103).

21403151235657 is a wasteful number, since it uses less digits than its factorization.

21403151235657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237656452 (or 237656449 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 21403151235657 in words is "twenty-one trillion, four hundred three billion, one hundred fifty-one million, two hundred thirty-five thousand, six hundred fifty-seven".