21425275577 has 16 divisors (see below), whose sum is σ = 23141939520. Its totient is φ = 19769184000.

The previous prime is 21425275561. The next prime is 21425275591. The reversal of 21425275577 is 77557252412.

It is a cyclic number.

It is not a de Polignac number, because 21425275577 - 2⁴ = 21425275561 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425275877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445298 + ... + 491060.

It is an arithmetic number, because the mean of its divisors is an integer number (1446371220).

Almost surely, 2^21425275577 is an apocalyptic number.

It is an amenable number.

21425275577 is a deficient number, since it is larger than the sum of its proper divisors (1716663943).

21425275577 is a wasteful number, since it uses less digits than its factorization.

21425275577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46424.

The product of its digits is 1372000, while the sum is 47.

The spelling of 21425275577 in words is "twenty-one billion, four hundred twenty-five million, two hundred seventy-five thousand, five hundred seventy-seven".