2400420021 has 16 divisors (see below), whose sum is σ = 3212352000. Its totient is φ = 1594397168.

The previous prime is 2400419969. The next prime is 2400420023. The reversal of 2400420021 is 1200240042.

It is a cyclic number.

It is not a de Polignac number, because 2400420021 - 2⁹ = 2400419509 is a prime.

It is a super-3 number, since 3×2400420021³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400420023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1183210 + ... + 1185236.

It is an arithmetic number, because the mean of its divisors is an integer number (200772000).

Almost surely, 2^2400420021 is an apocalyptic number.

It is an amenable number.

2400420021 is a deficient number, since it is larger than the sum of its proper divisors (811931979).

2400420021 is a wasteful number, since it uses less digits than its factorization.

2400420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288.

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

The square root of 2400420021 is about 48994.0814895024. The cubic root of 2400420021 is about 1338.9440000243.

Adding to 2400420021 its reverse (1200240042), we get a palindrome (3600660063).

The spelling of 2400420021 in words is "two billion, four hundred million, four hundred twenty thousand, twenty-one".