21552106571 has 2 divisors, whose sum is σ = 21552106572. Its totient is φ = 21552106570.

The previous prime is 21552106567. The next prime is 21552106679. The reversal of 21552106571 is 17560125512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21552106571 - 2² = 21552106567 is a prime.

It is not a weakly prime, because it can be changed into another prime (21552106531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776053285 + 10776053286.

It is an arithmetic number, because the mean of its divisors is an integer number (10776053286).

Almost surely, 2^21552106571 is an apocalyptic number.

21552106571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552106571 is an equidigital number, since it uses as much as digits as its factorization.

21552106571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 21552106571 in words is "twenty-one billion, five hundred fifty-two million, one hundred six thousand, five hundred seventy-one".