21061851048 has 96 divisors (see below), whose sum is σ = 66421555200. Its totient is φ = 5904123264.

The previous prime is 21061851047. The next prime is 21061851049. The reversal of 21061851048 is 84015816012.

21061851048 is a `hidden beast` number, since 21 + 0 + 618 + 5 + 10 + 4 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21061851047) and next prime (21061851049).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21061851047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 367528 + ... + 420951.

It is an arithmetic number, because the mean of its divisors is an integer number (691891200).

Almost surely, 2^21061851048 is an apocalyptic number.

21061851048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21061851048 is an abundant number, since it is smaller than the sum of its proper divisors (45359704152).

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

21061851048 is a wasteful number, since it uses less digits than its factorization.

21061851048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788551 (or 788544 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 21061851048 in words is "twenty-one billion, sixty-one million, eight hundred fifty-one thousand, forty-eight".