44142121 has 4 divisors (see below), whose sum is σ = 44158932. Its totient is φ = 44125312.

The previous prime is 44142103. The next prime is 44142157. The reversal of 44142121 is 12124144.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36240400 + 7901721 = 6020^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 44142121 - 2¹¹ = 44140073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44142521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520 + ... + 10033.

It is an arithmetic number, because the mean of its divisors is an integer number (11039733).

Almost surely, 2^44142121 is an apocalyptic number.

It is an amenable number.

44142121 is a deficient number, since it is larger than the sum of its proper divisors (16811).

44142121 is a wasteful number, since it uses less digits than its factorization.

44142121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16810.

The product of its digits is 256, while the sum is 19.

The square root of 44142121 is about 6643.9537174788. The cubic root of 44142121 is about 353.4145285297.

Adding to 44142121 its reverse (12124144), we get a palindrome (56266265).

The spelling of 44142121 in words is "forty-four million, one hundred forty-two thousand, one hundred twenty-one".