444212121 has 16 divisors (see below), whose sum is σ = 618609600. Its totient is φ = 283249728.

The previous prime is 444212107. The next prime is 444212123. The reversal of 444212121 is 121212444.

It is a de Polignac number, because none of the positive numbers 2^k-444212121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (444212123) 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, 27366 + ... + 40463.

It is an arithmetic number, because the mean of its divisors is an integer number (38663100).

Almost surely, 2^444212121 is an apocalyptic number.

It is an amenable number.

444212121 is a deficient number, since it is larger than the sum of its proper divisors (174397479).

444212121 is a wasteful number, since it uses less digits than its factorization.

444212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67928.

The product of its digits is 512, while the sum is 21.

The square root of 444212121 is about 21076.3403132517. The cubic root of 444212121 is about 763.0098332149.

Adding to 444212121 its reverse (121212444), we get a palindrome (565424565).

The spelling of 444212121 in words is "four hundred forty-four million, two hundred twelve thousand, one hundred twenty-one".