21676978311 has 16 divisors (see below), whose sum is σ = 29090424960. Its totient is φ = 14357489760.

The previous prime is 21676978289. The next prime is 21676978321. The reversal of 21676978311 is 11387967612.

It is a happy number.

It is not a de Polignac number, because 21676978311 - 2¹¹ = 21676976263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676978321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1744920 + ... + 1757298.

It is an arithmetic number, because the mean of its divisors is an integer number (1818151560).

Almost surely, 2^21676978311 is an apocalyptic number.

21676978311 is a deficient number, since it is larger than the sum of its proper divisors (7413446649).

21676978311 is a wasteful number, since it uses less digits than its factorization.

21676978311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16126.

The product of its digits is 762048, while the sum is 51.

The spelling of 21676978311 in words is "twenty-one billion, six hundred seventy-six million, nine hundred seventy-eight thousand, three hundred eleven".