2402400021 has 16 divisors (see below), whose sum is σ = 3671361024. Its totient is φ = 1368839664.

The previous prime is 2402400017. The next prime is 2402400023. The reversal of 2402400021 is 1200042042.

It is not a de Polignac number, because 2402400021 - 2² = 2402400017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402400023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157555 + ... + 172128.

It is an arithmetic number, because the mean of its divisors is an integer number (229460064).

Almost surely, 2^2402400021 is an apocalyptic number.

2402400021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2402400021 is a deficient number, since it is larger than the sum of its proper divisors (1268961003).

2402400021 is a wasteful number, since it uses less digits than its factorization.

2402400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330040.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2402400021 is about 49014.2838466503. The cubic root of 2402400021 is about 1339.3120440199.

Adding to 2402400021 its reverse (1200042042), we get a palindrome (3602442063).

The spelling of 2402400021 in words is "two billion, four hundred two million, four hundred thousand, twenty-one".