2456040221 has 4 divisors (see below), whose sum is σ = 2468766012. Its totient is φ = 2443314432.

The previous prime is 2456040203. The next prime is 2456040227. The reversal of 2456040221 is 1220406542.

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 415711321 + 2040328900 = 20389^2 + 45170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2456040221 - 2⁶ = 2456040157 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 (2456040227) 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, 6362606 + ... + 6362991.

It is an arithmetic number, because the mean of its divisors is an integer number (617191503).

Almost surely, 2^2456040221 is an apocalyptic number.

It is an amenable number.

2456040221 is a deficient number, since it is larger than the sum of its proper divisors (12725791).

2456040221 is a wasteful number, since it uses less digits than its factorization.

2456040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12725790.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 2456040221 is about 49558.4525686588. The cubic root of 2456040221 is about 1349.2067074131.

Adding to 2456040221 its reverse (1220406542), we get a palindrome (3676446763).

The spelling of 2456040221 in words is "two billion, four hundred fifty-six million, forty thousand, two hundred twenty-one".