21700754157 has 8 divisors (see below), whose sum is σ = 28956584160. Its totient is φ = 14456046800.

The previous prime is 21700754147. The next prime is 21700754161. The reversal of 21700754157 is 75145700712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21700754157 - 2⁶ = 21700754093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700754147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2776107 + ... + 2783912.

It is an arithmetic number, because the mean of its divisors is an integer number (3619573020).

Almost surely, 2^21700754157 is an apocalyptic number.

It is an amenable number.

21700754157 is a deficient number, since it is larger than the sum of its proper divisors (7255830003).

21700754157 is a wasteful number, since it uses less digits than its factorization.

21700754157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561323.

The product of its (nonzero) digits is 68600, while the sum is 39.

The spelling of 21700754157 in words is "twenty-one billion, seven hundred million, seven hundred fifty-four thousand, one hundred fifty-seven".