2901121021 has 4 divisors (see below), whose sum is σ = 2948680444. Its totient is φ = 2853561600.

The previous prime is 2901120991. The next prime is 2901121051. The reversal of 2901121021 is 1201211092.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2901120991) and next prime (2901121051).

It can be written as a sum of positive squares in 2 ways, for example, as 1268072100 + 1633048921 = 35610^2 + 40411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2901121021 - 2²³ = 2892732413 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 2901121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2901121051) 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, 23779620 + ... + 23779741.

It is an arithmetic number, because the mean of its divisors is an integer number (737170111).

Almost surely, 2^2901121021 is an apocalyptic number.

It is an amenable number.

2901121021 is a deficient number, since it is larger than the sum of its proper divisors (47559423).

2901121021 is an equidigital number, since it uses as much as digits as its factorization.

2901121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47559422.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2901121021 is about 53862.0554843574. The cubic root of 2901121021 is about 1426.2268733920.

The spelling of 2901121021 in words is "two billion, nine hundred one million, one hundred twenty-one thousand, twenty-one".