21757232201 has 2 divisors, whose sum is σ = 21757232202. Its totient is φ = 21757232200.

The previous prime is 21757232153. The next prime is 21757232209. The reversal of 21757232201 is 10223275712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17187472201 + 4569760000 = 131101^2 + 67600^2 .

It is a cyclic number.

It is not a de Polignac number, because 21757232201 - 2¹⁴ = 21757215817 is a prime.

It is not a weakly prime, because it can be changed into another prime (21757232209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10878616100 + 10878616101.

It is an arithmetic number, because the mean of its divisors is an integer number (10878616101).

Almost surely, 2^21757232201 is an apocalyptic number.

It is an amenable number.

21757232201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21757232201 is an equidigital number, since it uses as much as digits as its factorization.

21757232201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The spelling of 21757232201 in words is "twenty-one billion, seven hundred fifty-seven million, two hundred thirty-two thousand, two hundred one".