21452930323818 has 64 divisors (see below), whose sum is σ = 49634746140672. Its totient is φ = 6054499926720.

The previous prime is 21452930323729. The next prime is 21452930323843. The reversal of 21452930323818 is 81832303925412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19477155 + ... + 20549097.

It is an arithmetic number, because the mean of its divisors is an integer number (775542908448).

Almost surely, 2^{21452930323818} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452930323818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24817373070336).

21452930323818 is an abundant number, since it is smaller than the sum of its proper divisors (28181815816854).

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

21452930323818 is a wasteful number, since it uses less digits than its factorization.

21452930323818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077779.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 21452930323818 in words is "twenty-one trillion, four hundred fifty-two billion, nine hundred thirty million, three hundred twenty-three thousand, eight hundred eighteen".