44399820421 has 4 divisors (see below), whose sum is σ = 48436167744. Its totient is φ = 40363473100.

The previous prime is 44399820343. The next prime is 44399820469. The reversal of 44399820421 is 12402899344.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 44399820421 - 2¹³ = 44399812229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44399820481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018173645 + ... + 2018173666.

It is an arithmetic number, because the mean of its divisors is an integer number (12109041936).

Almost surely, 2^44399820421 is an apocalyptic number.

It is an amenable number.

44399820421 is a deficient number, since it is larger than the sum of its proper divisors (4036347323).

44399820421 is a wasteful number, since it uses less digits than its factorization.

44399820421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036347322.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 44399820421 in words is "forty-four billion, three hundred ninety-nine million, eight hundred twenty thousand, four hundred twenty-one".