2400042121 has 4 divisors (see below), whose sum is σ = 2410001044. Its totient is φ = 2390083200.

The previous prime is 2400042101. The next prime is 2400042131. The reversal of 2400042121 is 1212400042.

2400042121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1035552400 + 1364489721 = 32180^2 + 36939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400042121 - 2¹⁷ = 2399911049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2400042095 and 2400042104.

It is not an unprimeable number, because it can be changed into a prime (2400042101) 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, 4979100 + ... + 4979581.

It is an arithmetic number, because the mean of its divisors is an integer number (602500261).

Almost surely, 2^2400042121 is an apocalyptic number.

It is an amenable number.

2400042121 is a deficient number, since it is larger than the sum of its proper divisors (9958923).

2400042121 is an equidigital number, since it uses as much as digits as its factorization.

2400042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958922.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2400042121 is about 48990.2247494334. The cubic root of 2400042121 is about 1338.8737326700.

Adding to 2400042121 its reverse (1212400042), we get a palindrome (3612442163).

The spelling of 2400042121 in words is "two billion, four hundred million, forty-two thousand, one hundred twenty-one".