4144357921 has 4 divisors (see below), whose sum is σ = 4521117744. Its totient is φ = 3767598100.

The previous prime is 4144357907. The next prime is 4144357951. The reversal of 4144357921 is 1297534414.

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-4144357921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4144357951) 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, 188379895 + ... + 188379916.

It is an arithmetic number, because the mean of its divisors is an integer number (1130279436).

Almost surely, 2^4144357921 is an apocalyptic number.

It is an amenable number.

4144357921 is a deficient number, since it is larger than the sum of its proper divisors (376759823).

4144357921 is a wasteful number, since it uses less digits than its factorization.

4144357921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376759822.

The product of its digits is 120960, while the sum is 40.

The square root of 4144357921 is about 64376.6877137990. The cubic root of 4144357921 is about 1606.2719860405.

The spelling of 4144357921 in words is "four billion, one hundred forty-four million, three hundred fifty-seven thousand, nine hundred twenty-one".