21122625748 has 12 divisors (see below), whose sum is σ = 42245251552. Its totient is φ = 9052553880.

The previous prime is 21122625739. The next prime is 21122625751. The reversal of 21122625748 is 84752622112.

It is a happy number.

21122625748 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122625748.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377189718 + ... + 377189773.

Almost surely, 2^21122625748 is an apocalyptic number.

21122625748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21122625748 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21122625748 is a wasteful number, since it uses less digits than its factorization.

21122625748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754379502 (or 754379500 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The spelling of 21122625748 in words is "twenty-one billion, one hundred twenty-two million, six hundred twenty-five thousand, seven hundred forty-eight".