21851146746 has 96 divisors (see below), whose sum is σ = 55702378368. Its totient is φ = 6103278720.

The previous prime is 21851146727. The next prime is 21851146763. The reversal of 21851146746 is 64764115812.

21851146746 is a `hidden beast` number, since 2 + 185 + 1 + 1 + 467 + 4 + 6 = 666.

It is a super-2 number, since 2×21851146746² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1865460 + ... + 1877136.

It is an arithmetic number, because the mean of its divisors is an integer number (580233108).

Almost surely, 2^21851146746 is an apocalyptic number.

21851146746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21851146746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27851189184).

21851146746 is an abundant number, since it is smaller than the sum of its proper divisors (33851231622).

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

21851146746 is a wasteful number, since it uses less digits than its factorization.

21851146746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12436 (or 12433 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 21851146746 in words is "twenty-one billion, eight hundred fifty-one million, one hundred forty-six thousand, seven hundred forty-six".