21280876601 has 4 divisors (see below), whose sum is σ = 21775780752. Its totient is φ = 20785972452.

The previous prime is 21280876583. The next prime is 21280876637. The reversal of 21280876601 is 10667808212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21280876601 - 2¹⁴ = 21280860217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21280870601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247452011 + ... + 247452096.

It is an arithmetic number, because the mean of its divisors is an integer number (5443945188).

Almost surely, 2^21280876601 is an apocalyptic number.

It is an amenable number.

21280876601 is a deficient number, since it is larger than the sum of its proper divisors (494904151).

21280876601 is an equidigital number, since it uses as much as digits as its factorization.

21280876601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494904150.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 21280876601 in words is "twenty-one billion, two hundred eighty million, eight hundred seventy-six thousand, six hundred one".