21473507730 has 64 divisors (see below), whose sum is σ = 51730099200. Its totient is φ = 5704796160.

The previous prime is 21473507729. The next prime is 21473507753. The reversal of 21473507730 is 3770537412.

It is a super-2 number, since 2×21473507730² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14498590 + ... + 14500070.

It is an arithmetic number, because the mean of its divisors is an integer number (808282800).

Almost surely, 2^21473507730 is an apocalyptic number.

21473507730 is an abundant number, since it is smaller than the sum of its proper divisors (30256591470).

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

21473507730 is a wasteful number, since it uses less digits than its factorization.

21473507730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979.

The product of its (nonzero) digits is 123480, while the sum is 39.

The spelling of 21473507730 in words is "twenty-one billion, four hundred seventy-three million, five hundred seven thousand, seven hundred thirty".