21858315449648 has 40 divisors (see below), whose sum is σ = 45285668451360. Its totient is φ = 10184421862400.

The previous prime is 21858315449627. The next prime is 21858315449669. The reversal of 21858315449648 is 84694451385812.

It is an interprime number because it is at equal distance from previous prime (21858315449627) and next prime (21858315449669).

It is a Harshad number since it is a multiple of its sum of digits (68).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397801508 + ... + 397856451.

It is an arithmetic number, because the mean of its divisors is an integer number (1132141711284).

Almost surely, 2^{21858315449648} is an apocalyptic number.

It is an amenable number.

21858315449648 is an abundant number, since it is smaller than the sum of its proper divisors (23427353001712).

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

21858315449648 is a wasteful number, since it uses less digits than its factorization.

21858315449648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795658085 (or 795658079 counting only the distinct ones).

The product of its digits is 265420800, while the sum is 68.

The spelling of 21858315449648 in words is "twenty-one trillion, eight hundred fifty-eight billion, three hundred fifteen million, four hundred forty-nine thousand, six hundred forty-eight".