21753002641 has 2 divisors, whose sum is σ = 21753002642. Its totient is φ = 21753002640.

The previous prime is 21753002639. The next prime is 21753002657. The reversal of 21753002641 is 14620035712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18442726416 + 3310276225 = 135804^2 + 57535^2 .

It is a cyclic number.

It is not a de Polignac number, because 21753002641 - 2¹ = 21753002639 is a prime.

Together with 21753002639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21753002441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876501320 + 10876501321.

It is an arithmetic number, because the mean of its divisors is an integer number (10876501321).

Almost surely, 2^21753002641 is an apocalyptic number.

It is an amenable number.

21753002641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753002641 is an equidigital number, since it uses as much as digits as its factorization.

21753002641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21753002641 in words is "twenty-one billion, seven hundred fifty-three million, two thousand, six hundred forty-one".