21545150344 has 32 divisors (see below), whose sum is σ = 41762841120. Its totient is φ = 10413559296.

The previous prime is 21545150329. The next prime is 21545150383. The reversal of 21545150344 is 44305154512.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 289474 + ... + 356209.

It is an arithmetic number, because the mean of its divisors is an integer number (1305088785).

Almost surely, 2^21545150344 is an apocalyptic number.

It is an amenable number.

21545150344 is a deficient number, since it is larger than the sum of its proper divisors (20217690776).

21545150344 is a wasteful number, since it uses less digits than its factorization.

21545150344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645829 (or 645825 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21545150344 in words is "twenty-one billion, five hundred forty-five million, one hundred fifty thousand, three hundred forty-four".