21725252711 has 2 divisors, whose sum is σ = 21725252712. Its totient is φ = 21725252710.

The previous prime is 21725252683. The next prime is 21725252749. The reversal of 21725252711 is 11725252712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21725252711 - 2²² = 21721058407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21725252771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10862626355 + 10862626356.

It is an arithmetic number, because the mean of its divisors is an integer number (10862626356).

Almost surely, 2^21725252711 is an apocalyptic number.

21725252711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21725252711 is an equidigital number, since it uses as much as digits as its factorization.

21725252711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 35.

Subtracting from 21725252711 its reverse (11725252712), we obtain a palindrome (9999999999).

The spelling of 21725252711 in words is "twenty-one billion, seven hundred twenty-five million, two hundred fifty-two thousand, seven hundred eleven".