21405740600 has 48 divisors (see below), whose sum is σ = 50148319320. Its totient is φ = 8496924800.

The previous prime is 21405740561. The next prime is 21405740611. The reversal of 21405740600 is 604750412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382307 + ... + 434706.

Almost surely, 2^21405740600 is an apocalyptic number.

21405740600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21405740600 is an abundant number, since it is smaller than the sum of its proper divisors (28742578720).

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

21405740600 is a wasteful number, since it uses less digits than its factorization.

21405740600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817160 (or 817151 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The spelling of 21405740600 in words is "twenty-one billion, four hundred five million, seven hundred forty thousand, six hundred".