21572898261 has 16 divisors (see below), whose sum is σ = 29067192000. Its totient is φ = 14230338048.

The previous prime is 21572898253. The next prime is 21572898283. The reversal of 21572898261 is 16289827512.

It is not a de Polignac number, because 21572898261 - 2³ = 21572898253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572898241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2235595 + ... + 2245223.

It is an arithmetic number, because the mean of its divisors is an integer number (1816699500).

Almost surely, 2^21572898261 is an apocalyptic number.

It is an amenable number.

21572898261 is a deficient number, since it is larger than the sum of its proper divisors (7494293739).

21572898261 is an equidigital number, since it uses as much as digits as its factorization.

21572898261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17428.

The product of its digits is 967680, while the sum is 51.

The spelling of 21572898261 in words is "twenty-one billion, five hundred seventy-two million, eight hundred ninety-eight thousand, two hundred sixty-one".