21757232153 has 2 divisors, whose sum is σ = 21757232154. Its totient is φ = 21757232152.

The previous prime is 21757232117. The next prime is 21757232201. The reversal of 21757232153 is 35123275712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19199704969 + 2557527184 = 138563^2 + 50572^2 .

It is a cyclic number.

It is not a de Polignac number, because 21757232153 - 2¹⁸ = 21756970009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21753232153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10878616076 + 10878616077.

It is an arithmetic number, because the mean of its divisors is an integer number (10878616077).

Almost surely, 2^21757232153 is an apocalyptic number.

It is an amenable number.

21757232153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21757232153 is an equidigital number, since it uses as much as digits as its factorization.

21757232153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 38.

The spelling of 21757232153 in words is "twenty-one billion, seven hundred fifty-seven million, two hundred thirty-two thousand, one hundred fifty-three".