21757050357 has 16 divisors (see below), whose sum is σ = 33225532032. Its totient is φ = 12405625920.

The previous prime is 21757050349. The next prime is 21757050389. The reversal of 21757050357 is 75305075712.

It is a happy number.

It is not a de Polignac number, because 21757050357 - 2³ = 21757050349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21757050317) 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, 1114018 + ... + 1133379.

It is an arithmetic number, because the mean of its divisors is an integer number (2076595752).

Almost surely, 2^21757050357 is an apocalyptic number.

It is an amenable number.

21757050357 is a deficient number, since it is larger than the sum of its proper divisors (11468481675).

21757050357 is a wasteful number, since it uses less digits than its factorization.

21757050357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247868.

The product of its (nonzero) digits is 257250, while the sum is 42.

The spelling of 21757050357 in words is "twenty-one billion, seven hundred fifty-seven million, fifty thousand, three hundred fifty-seven".