1109641021 has 4 divisors (see below), whose sum is σ = 1168043200. Its totient is φ = 1051238844.

The previous prime is 1109641009. The next prime is 1109641061. The reversal of 1109641021 is 1201469011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1109641021 - 2⁹ = 1109640509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109641061) 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, 29201061 + ... + 29201098.

It is an arithmetic number, because the mean of its divisors is an integer number (292010800).

Almost surely, 2^1109641021 is an apocalyptic number.

It is an amenable number.

1109641021 is a deficient number, since it is larger than the sum of its proper divisors (58402179).

1109641021 is an equidigital number, since it uses as much as digits as its factorization.

1109641021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58402178.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1109641021 is about 33311.2746829058. The cubic root of 1109641021 is about 1035.2871758678.

The spelling of 1109641021 in words is "one billion, one hundred nine million, six hundred forty-one thousand, twenty-one".