444152021 has 4 divisors (see below), whose sum is σ = 453602112. Its totient is φ = 434701932.

The previous prime is 444151993. The next prime is 444152029. The reversal of 444152021 is 120251444.

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 a de Polignac number, because none of the positive numbers 2^k-444152021 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 (444152029) 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, 4724975 + ... + 4725068.

It is an arithmetic number, because the mean of its divisors is an integer number (113400528).

Almost surely, 2^444152021 is an apocalyptic number.

It is an amenable number.

444152021 is a deficient number, since it is larger than the sum of its proper divisors (9450091).

444152021 is an equidigital number, since it uses as much as digits as its factorization.

444152021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450090.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 444152021 is about 21074.9144956747. The cubic root of 444152021 is about 762.9754210073.

The spelling of 444152021 in words is "four hundred forty-four million, one hundred fifty-two thousand, twenty-one".