21757038201 has 6 divisors (see below), whose sum is σ = 31426832970. Its totient is φ = 14504692128.

The previous prime is 21757038169. The next prime is 21757038217. The reversal of 21757038201 is 10283075712.

21757038201 is a `hidden beast` number, since 2 + 1 + 7 + 570 + 3 + 82 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17404205625 + 4352832576 = 131925^2 + 65976^2 .

It is not a de Polignac number, because 21757038201 - 2⁵ = 21757038169 is a prime.

It is a super-2 number, since 2×21757038201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21757038241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1208724336 + ... + 1208724353.

It is an arithmetic number, because the mean of its divisors is an integer number (5237805495).

Almost surely, 2^21757038201 is an apocalyptic number.

It is an amenable number.

21757038201 is a deficient number, since it is larger than the sum of its proper divisors (9669794769).

21757038201 is a wasteful number, since it uses less digits than its factorization.

21757038201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417448695 (or 2417448692 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 21757038201 in words is "twenty-one billion, seven hundred fifty-seven million, thirty-eight thousand, two hundred one".