21444575890 has 8 divisors (see below), whose sum is σ = 38600236620. Its totient is φ = 8577830352.

The previous prime is 21444575869. The next prime is 21444575953. The reversal of 21444575890 is 9857544412.

It can be written as a sum of positive squares in 2 ways, for example, as 20821624209 + 622951681 = 144297^2 + 24959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072228785 + ... + 1072228804.

Almost surely, 2^21444575890 is an apocalyptic number.

21444575890 is a deficient number, since it is larger than the sum of its proper divisors (17155660730).

21444575890 is a wasteful number, since it uses less digits than its factorization.

21444575890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144457596.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 21444575890 in words is "twenty-one billion, four hundred forty-four million, five hundred seventy-five thousand, eight hundred ninety".