21405846180 has 24 divisors (see below), whose sum is σ = 59936369472. Its totient is φ = 5708225632.

The previous prime is 21405846179. The next prime is 21405846197. The reversal of 21405846180 is 8164850412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178381992 + ... + 178382111.

It is an arithmetic number, because the mean of its divisors is an integer number (2497348728).

Almost surely, 2^21405846180 is an apocalyptic number.

21405846180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21405846180 is an abundant number, since it is smaller than the sum of its proper divisors (38530523292).

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

21405846180 is a wasteful number, since it uses less digits than its factorization.

21405846180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356764115 (or 356764113 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 21405846180 in words is "twenty-one billion, four hundred five million, eight hundred forty-six thousand, one hundred eighty".