21304443654 has 48 divisors (see below), whose sum is σ = 50866447632. Its totient is φ = 6402763584.

The previous prime is 21304443653. The next prime is 21304443679. The reversal of 21304443654 is 45634440312.

21304443654 is a `hidden beast` number, since 2 + 130 + 44 + 436 + 54 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304443653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1048597 + ... + 1068720.

It is an arithmetic number, because the mean of its divisors is an integer number (1059717659).

Almost surely, 2^21304443654 is an apocalyptic number.

21304443654 is an abundant number, since it is smaller than the sum of its proper divisors (29562003978).

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

21304443654 is a wasteful number, since it uses less digits than its factorization.

21304443654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117381 (or 2117378 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 21304443654 its reverse (45634440312), we get a palindrome (66938883966).

The spelling of 21304443654 in words is "twenty-one billion, three hundred four million, four hundred forty-three thousand, six hundred fifty-four".