44120021 has 16 divisors (see below), whose sum is σ = 50601408. Its totient is φ = 38102400.

The previous prime is 44119987. The next prime is 44120029. The reversal of 44120021 is 12002144.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44120021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 44119978 and 44120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44120029) 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, 16241 + ... + 18761.

It is an arithmetic number, because the mean of its divisors is an integer number (3162588).

Almost surely, 2^44120021 is an apocalyptic number.

It is an amenable number.

44120021 is a deficient number, since it is larger than the sum of its proper divisors (6481387).

44120021 is a wasteful number, since it uses less digits than its factorization.

44120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 44120021 is about 6642.2903429465. The cubic root of 44120021 is about 353.3555390300.

Adding to 44120021 its reverse (12002144), we get a palindrome (56122165).

The spelling of 44120021 in words is "forty-four million, one hundred twenty thousand, twenty-one".