3021091921 has 4 divisors (see below), whose sum is σ = 3102743092. Its totient is φ = 2939440752.

The previous prime is 3021091919. The next prime is 3021091939. The reversal of 3021091921 is 1291901203.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2695686400 + 325405521 = 51920^2 + 18039^2 .

It is a cyclic number.

It is not a de Polignac number, because 3021091921 - 2¹ = 3021091919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3021091921.

It is not an unprimeable number, because it can be changed into a prime (3021091321) 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, 40825530 + ... + 40825603.

It is an arithmetic number, because the mean of its divisors is an integer number (775685773).

Almost surely, 2^3021091921 is an apocalyptic number.

It is an amenable number.

3021091921 is a deficient number, since it is larger than the sum of its proper divisors (81651171).

3021091921 is an equidigital number, since it uses as much as digits as its factorization.

3021091921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81651170.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 3021091921 is about 54964.4605267804. The cubic root of 3021091921 is about 1445.6216592960.

The spelling of 3021091921 in words is "three billion, twenty-one million, ninety-one thousand, nine hundred twenty-one".