21552746946 has 32 divisors (see below), whose sum is σ = 43274996928. Its totient is φ = 7156034880.

The previous prime is 21552746923. The next prime is 21552746947. The reversal of 21552746946 is 64964725512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21552746947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2984436 + ... + 2991648.

It is an arithmetic number, because the mean of its divisors is an integer number (1352343654).

Almost surely, 2^21552746946 is an apocalyptic number.

21552746946 is an abundant number, since it is smaller than the sum of its proper divisors (21722249982).

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

21552746946 is a wasteful number, since it uses less digits than its factorization.

21552746946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106.

The product of its digits is 3628800, while the sum is 51.

The spelling of 21552746946 in words is "twenty-one billion, five hundred fifty-two million, seven hundred forty-six thousand, nine hundred forty-six".