21944545890 has 32 divisors (see below), whose sum is σ = 52739406720. Its totient is φ = 5843823744.

The previous prime is 21944545871. The next prime is 21944545921. The reversal of 21944545890 is 9854544912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481275 + ... + 524894.

It is an arithmetic number, because the mean of its divisors is an integer number (1648106460).

Almost surely, 2^21944545890 is an apocalyptic number.

21944545890 is an abundant number, since it is smaller than the sum of its proper divisors (30794860830).

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

21944545890 is a wasteful number, since it uses less digits than its factorization.

21944545890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006906.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 21944545890 in words is "twenty-one billion, nine hundred forty-four million, five hundred forty-five thousand, eight hundred ninety".