21279076553 has 4 divisors (see below), whose sum is σ = 24318944640. Its totient is φ = 18239208468.

The previous prime is 21279076541. The next prime is 21279076561. The reversal of 21279076553 is 35567097212.

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 21279076553 - 2¹⁴ = 21279060169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21279076498 and 21279076507.

It is not an unprimeable number, because it can be changed into a prime (21279076153) 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 3 ways as a sum of consecutive naturals, for example, 1519934033 + ... + 1519934046.

It is an arithmetic number, because the mean of its divisors is an integer number (6079736160).

Almost surely, 2^21279076553 is an apocalyptic number.

It is an amenable number.

21279076553 is a deficient number, since it is larger than the sum of its proper divisors (3039868087).

21279076553 is an equidigital number, since it uses as much as digits as its factorization.

21279076553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039868086.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 21279076553 in words is "twenty-one billion, two hundred seventy-nine million, seventy-six thousand, five hundred fifty-three".