21141544757 has 2 divisors, whose sum is σ = 21141544758. Its totient is φ = 21141544756.

The previous prime is 21141544751. The next prime is 21141544759. The reversal of 21141544757 is 75744514112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16218277201 + 4923267556 = 127351^2 + 70166^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141544757 - 2¹⁶ = 21141479221 is a prime.

Together with 21141544759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141544751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570772378 + 10570772379.

It is an arithmetic number, because the mean of its divisors is an integer number (10570772379).

Almost surely, 2^21141544757 is an apocalyptic number.

It is an amenable number.

21141544757 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141544757 is an equidigital number, since it uses as much as digits as its factorization.

21141544757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 41.

The spelling of 21141544757 in words is "twenty-one billion, one hundred forty-one million, five hundred forty-four thousand, seven hundred fifty-seven".