21813814477 has 16 divisors (see below), whose sum is σ = 26975036032. Its totient is φ = 17177469120.

The previous prime is 21813814459. The next prime is 21813814493. The reversal of 21813814477 is 77441831812.

It is not a de Polignac number, because 21813814477 - 2¹⁵ = 21813781709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21813814427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548838 + ... + 587239.

It is an arithmetic number, because the mean of its divisors is an integer number (1685939752).

Almost surely, 2^21813814477 is an apocalyptic number.

It is an amenable number.

21813814477 is a deficient number, since it is larger than the sum of its proper divisors (5161221555).

21813814477 is a wasteful number, since it uses less digits than its factorization.

21813814477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136308.

The product of its digits is 301056, while the sum is 46.

The spelling of 21813814477 in words is "twenty-one billion, eight hundred thirteen million, eight hundred fourteen thousand, four hundred seventy-seven".