2040040721 has 2 divisors, whose sum is σ = 2040040722. Its totient is φ = 2040040720.

The previous prime is 2040040703. The next prime is 2040040759. The reversal of 2040040721 is 1270400402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1945251025 + 94789696 = 44105^2 + 9736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2040040721 is a prime.

It is a super-2 number, since 2×2040040721² = 8323532286676399682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2040040693 and 2040040702.

It is not a weakly prime, because it can be changed into another prime (2040040021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020020360 + 1020020361.

It is an arithmetic number, because the mean of its divisors is an integer number (1020020361).

Almost surely, 2^2040040721 is an apocalyptic number.

It is an amenable number.

2040040721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040040721 is an equidigital number, since it uses as much as digits as its factorization.

2040040721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2040040721 is about 45166.8099493422. The cubic root of 2040040721 is about 1268.2735797504.

The spelling of 2040040721 in words is "two billion, forty million, forty thousand, seven hundred twenty-one".