21987625193748 has 72 divisors (see below), whose sum is σ = 58008765866688. Its totient is φ = 7009045705728.

The previous prime is 21987625193671. The next prime is 21987625193753. The reversal of 21987625193748 is 84739152678912.

21987625193748 is a `hidden beast` number, since 2 + 1 + 9 + 8 + 7 + 62 + 519 + 3 + 7 + 48 = 666.

It is a super-3 number, since 3×21987625193748³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1027911 + ... + 6710577.

It is an arithmetic number, because the mean of its divisors is an integer number (805677303704).

Almost surely, 2^{21987625193748} is an apocalyptic number.

It is an amenable number.

21987625193748 is an abundant number, since it is smaller than the sum of its proper divisors (36021140672940).

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

21987625193748 is a wasteful number, since it uses less digits than its factorization.

21987625193748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687373 (or 5687368 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 72.

The spelling of 21987625193748 in words is "twenty-one trillion, nine hundred eighty-seven billion, six hundred twenty-five million, one hundred ninety-three thousand, seven hundred forty-eight".