21425877246618 has 128 divisors (see below), whose sum is σ = 53977123200000. Its totient is φ = 6245275442112.

The previous prime is 21425877246617. The next prime is 21425877246623. The reversal of 21425877246618 is 81664277852412.

21425877246618 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 5 + 8 + 7 + 7 + 2 + 4 + 6 + 618 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21425877246617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 401967333 + ... + 402020631.

It is an arithmetic number, because the mean of its divisors is an integer number (421696275000).

Almost surely, 2^{21425877246618} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21425877246618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26988561600000).

21425877246618 is an abundant number, since it is smaller than the sum of its proper divisors (32551245953382).

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

21425877246618 is a wasteful number, since it uses less digits than its factorization.

21425877246618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83481 (or 83475 counting only the distinct ones).

The product of its digits is 72253440, while the sum is 63.

The spelling of 21425877246618 in words is "twenty-one trillion, four hundred twenty-five billion, eight hundred seventy-seven million, two hundred forty-six thousand, six hundred eighteen".