21004464426 has 32 divisors (see below), whose sum is σ = 45905289408. Its totient is φ = 6354243840.

The previous prime is 21004464419. The next prime is 21004464443. The reversal of 21004464426 is 62446440012.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 229201 + ... + 307476.

It is an arithmetic number, because the mean of its divisors is an integer number (1434540294).

Almost surely, 2^21004464426 is an apocalyptic number.

21004464426 is an abundant number, since it is smaller than the sum of its proper divisors (24900824982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21004464426 is a wasteful number, since it uses less digits than its factorization.

21004464426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537286.

The product of its (nonzero) digits is 36864, while the sum is 33.

The spelling of 21004464426 in words is "twenty-one billion, four million, four hundred sixty-four thousand, four hundred twenty-six".