44427980821 has 16 divisors (see below), whose sum is σ = 51490857600. Its totient is φ = 37544525568.

The previous prime is 44427980749. The next prime is 44427980833. The reversal of 44427980821 is 12808972444.

It is a cyclic number.

It is not a de Polignac number, because 44427980821 - 2¹⁹ = 44427456533 is a prime.

It is a super-2 number, since 2×44427980821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44427980881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1378590 + ... + 1410448.

It is an arithmetic number, because the mean of its divisors is an integer number (3218178600).

Almost surely, 2^44427980821 is an apocalyptic number.

It is an amenable number.

44427980821 is a deficient number, since it is larger than the sum of its proper divisors (7062876779).

44427980821 is a wasteful number, since it uses less digits than its factorization.

44427980821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34668.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 44427980821 in words is "forty-four billion, four hundred twenty-seven million, nine hundred eighty thousand, eight hundred twenty-one".