21828889725 has 12 divisors (see below), whose sum is σ = 36090431136. Its totient is φ = 11642074480.

The previous prime is 21828889697. The next prime is 21828889739. The reversal of 21828889725 is 52798882812.

It is not a de Polignac number, because 21828889725 - 2⁷ = 21828889597 is a prime.

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, 145525857 + ... + 145526006.

It is an arithmetic number, because the mean of its divisors is an integer number (3007535928).

Almost surely, 2^21828889725 is an apocalyptic number.

21828889725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21828889725 is a deficient number, since it is larger than the sum of its proper divisors (14261541411).

21828889725 is a wasteful number, since it uses less digits than its factorization.

21828889725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291051876 (or 291051871 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 60.

The spelling of 21828889725 in words is "twenty-one billion, eight hundred twenty-eight million, eight hundred eighty-nine thousand, seven hundred twenty-five".