21949487360784 has 45 divisors (see below), whose sum is σ = 61428236550343. Its totient is φ = 7316477046816.

The previous prime is 21949487360693. The next prime is 21949487360809. The reversal of 21949487360784 is 48706378494912.

The square root of 21949487360784 is 4685028.

It is a perfect power (a square), and thus also a powerful number.

21949487360784 is a `hidden beast` number, since 2 + 1 + 9 + 4 + 9 + 4 + 8 + 7 + 3 + 607 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 56025127 + ... + 56415545.

Almost surely, 2^{21949487360784} is an apocalyptic number.

21949487360784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

21949487360784 is the 4685028-th square number.

It is an amenable number.

21949487360784 is an abundant number, since it is smaller than the sum of its proper divisors (39478749189559).

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

21949487360784 is an frugal number, since it uses more digits than its factorization.

21949487360784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780852 (or 390424 counting only the distinct ones).

The product of its (nonzero) digits is 585252864, while the sum is 72.

The spelling of 21949487360784 in words is "twenty-one trillion, nine hundred forty-nine billion, four hundred eighty-seven million, three hundred sixty thousand, seven hundred eighty-four".