21311976554 has 16 divisors (see below), whose sum is σ = 34950470976. Its totient is φ = 9666060000.

The previous prime is 21311976551. The next prime is 21311976559. The reversal of 21311976554 is 45567911312.

It is not an unprimeable number, because it can be changed into a prime (21311976551) 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 7 ways as a sum of consecutive naturals, for example, 1049822 + ... + 1069929.

It is an arithmetic number, because the mean of its divisors is an integer number (2184404436).

Almost surely, 2^21311976554 is an apocalyptic number.

21311976554 is a deficient number, since it is larger than the sum of its proper divisors (13638494422).

21311976554 is a wasteful number, since it uses less digits than its factorization.

21311976554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120221.

The product of its digits is 226800, while the sum is 44.

The spelling of 21311976554 in words is "twenty-one billion, three hundred eleven million, nine hundred seventy-six thousand, five hundred fifty-four".