2400001021 has 4 divisors (see below), whose sum is σ = 2618182944. Its totient is φ = 2181819100.

The previous prime is 2400000949. The next prime is 2400001031. The reversal of 2400001021 is 1201000042.

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 2400001021 - 2⁹ = 2400000509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2400000989 and 2400001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109090945 + ... + 109090966.

It is an arithmetic number, because the mean of its divisors is an integer number (654545736).

Almost surely, 2^2400001021 is an apocalyptic number.

It is an amenable number.

2400001021 is a deficient number, since it is larger than the sum of its proper divisors (218181923).

2400001021 is a wasteful number, since it uses less digits than its factorization.

2400001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218181922.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2400001021 is about 48989.8052762001. The cubic root of 2400001021 is about 1338.8660900229.

Adding to 2400001021 its reverse (1201000042), we get a palindrome (3601001063).

The spelling of 2400001021 in words is "two billion, four hundred million, one thousand, twenty-one".