2402042400221 has 4 divisors (see below), whose sum is σ = 2404332241500. Its totient is φ = 2399752558944.

The previous prime is 2402042400187. The next prime is 2402042400229. The reversal of 2402042400221 is 1220042402042.

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 1803568420900 + 598473979321 = 1342970^2 + 773611^2 .

It is a cyclic number.

It is not a de Polignac number, because 2402042400221 - 2¹⁴ = 2402042383837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402042400229) 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, 1144919066 + ... + 1144921163.

It is an arithmetic number, because the mean of its divisors is an integer number (601083060375).

Almost surely, 2^{2402042400221} is an apocalyptic number.

It is an amenable number.

2402042400221 is a deficient number, since it is larger than the sum of its proper divisors (2289841279).

2402042400221 is a wasteful number, since it uses less digits than its factorization.

2402042400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289841278.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 2402042400221 its reverse (1220042402042), we get a palindrome (3622084802263).

The spelling of 2402042400221 in words is "two trillion, four hundred two billion, forty-two million, four hundred thousand, two hundred twenty-one".