21704033157 has 16 divisors (see below), whose sum is σ = 29013304320. Its totient is φ = 14432109552.

The previous prime is 21704033137. The next prime is 21704033177. The reversal of 21704033157 is 75133040712.

It is an interprime number because it is at equal distance from previous prime (21704033137) and next prime (21704033177).

It is not a de Polignac number, because 21704033157 - 2²³ = 21695644549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704033137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1952068 + ... + 1963154.

It is an arithmetic number, because the mean of its divisors is an integer number (1813331520).

Almost surely, 2^21704033157 is an apocalyptic number.

It is an amenable number.

21704033157 is a deficient number, since it is larger than the sum of its proper divisors (7309271163).

21704033157 is a wasteful number, since it uses less digits than its factorization.

21704033157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12712.

The product of its (nonzero) digits is 17640, while the sum is 33.

Adding to 21704033157 its reverse (75133040712), we get a palindrome (96837073869).

The spelling of 21704033157 in words is "twenty-one billion, seven hundred four million, thirty-three thousand, one hundred fifty-seven".