21843996725 has 12 divisors (see below), whose sum is σ = 27228376320. Its totient is φ = 17383700400.

The previous prime is 21843996661. The next prime is 21843996731. The reversal of 21843996725 is 52769934812.

It is not a de Polignac number, because 21843996725 - 2⁶ = 21843996661 is a prime.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2282555 + ... + 2292104.

It is an arithmetic number, because the mean of its divisors is an integer number (2269031360).

Almost surely, 2^21843996725 is an apocalyptic number.

21843996725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21843996725 is a deficient number, since it is larger than the sum of its proper divisors (5384379595).

21843996725 is a wasteful number, since it uses less digits than its factorization.

21843996725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574860 (or 4574855 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The spelling of 21843996725 in words is "twenty-one billion, eight hundred forty-three million, nine hundred ninety-six thousand, seven hundred twenty-five".