2044121021 has 16 divisors (see below), whose sum is σ = 2296771200. Its totient is φ = 1809020928.

The previous prime is 2044121011. The next prime is 2044121029. The reversal of 2044121021 is 1201214402.

It is a cyclic number.

It is not a de Polignac number, because 2044121021 - 2⁶ = 2044120957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2044121029) 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, 21236 + ... + 67373.

It is an arithmetic number, because the mean of its divisors is an integer number (143548200).

Almost surely, 2^2044121021 is an apocalyptic number.

It is an amenable number.

2044121021 is a deficient number, since it is larger than the sum of its proper divisors (252650179).

2044121021 is a wasteful number, since it uses less digits than its factorization.

2044121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88708.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2044121021 is about 45211.9566154795. The cubic root of 2044121021 is about 1269.1185776501.

Adding to 2044121021 its reverse (1201214402), we get a palindrome (3245335423).

The spelling of 2044121021 in words is "two billion, forty-four million, one hundred twenty-one thousand, twenty-one".