1044138021 has 24 divisors (see below), whose sum is σ = 1435576032. Its totient is φ = 675024000.

The previous prime is 1044138019. The next prime is 1044138031. The reversal of 1044138021 is 1208314401.

It is not a de Polignac number, because 1044138021 - 2¹ = 1044138019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1044137982 and 1044138000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1044138031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 992946 + ... + 993996.

It is an arithmetic number, because the mean of its divisors is an integer number (59815668).

Almost surely, 2^1044138021 is an apocalyptic number.

It is an amenable number.

1044138021 is a deficient number, since it is larger than the sum of its proper divisors (391438011).

1044138021 is a wasteful number, since it uses less digits than its factorization.

1044138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1044138021 is about 32313.1245935765. The cubic root of 1044138021 is about 1014.5013675111.

The spelling of 1044138021 in words is "one billion, forty-four million, one hundred thirty-eight thousand, twenty-one".