21304645542 has 64 divisors (see below), whose sum is σ = 47814624000. Its totient is φ = 7031157120.

The previous prime is 21304645529. The next prime is 21304645543. The reversal of 21304645542 is 24554640312.

21304645542 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 4 + 645 + 5 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21304645497 and 21304645506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304645543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3300334 + ... + 3306782.

It is an arithmetic number, because the mean of its divisors is an integer number (747103500).

Almost surely, 2^21304645542 is an apocalyptic number.

21304645542 is an abundant number, since it is smaller than the sum of its proper divisors (26509978458).

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

21304645542 is a wasteful number, since it uses less digits than its factorization.

21304645542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058 (or 7052 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 21304645542 in words is "twenty-one billion, three hundred four million, six hundred forty-five thousand, five hundred forty-two".