1044100021 has 4 divisors (see below), whose sum is σ = 1080103500. Its totient is φ = 1008096544.

The previous prime is 1044100009. The next prime is 1044100087. The reversal of 1044100021 is 1200014401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200014401 = 31991 ⋅37511.

It can be written as a sum of positive squares in 2 ways, for example, as 836019396 + 208080625 = 28914^2 + 14425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1044100021 - 2¹⁵ = 1044067253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1044099974 and 1044100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1044100621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18001696 + ... + 18001753.

It is an arithmetic number, because the mean of its divisors is an integer number (270025875).

Almost surely, 2^1044100021 is an apocalyptic number.

It is an amenable number.

1044100021 is a deficient number, since it is larger than the sum of its proper divisors (36003479).

1044100021 is an equidigital number, since it uses as much as digits as its factorization.

1044100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36003478.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1044100021 is about 32312.5365918555. The cubic root of 1044100021 is about 1014.4890602238.

Adding to 1044100021 its reverse (1200014401), we get a palindrome (2244114422).

The spelling of 1044100021 in words is "one billion, forty-four million, one hundred thousand, twenty-one".