2521045421 has 4 divisors (see below), whose sum is σ = 2521220700. Its totient is φ = 2520870144.

The previous prime is 2521045411. The next prime is 2521045451. The reversal of 2521045421 is 1245401252.

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 503778025 + 2017267396 = 22445^2 + 44914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521045421 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 (2521045411) 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, 63926 + ... + 95543.

It is an arithmetic number, because the mean of its divisors is an integer number (630305175).

Almost surely, 2^2521045421 is an apocalyptic number.

It is an amenable number.

2521045421 is a deficient number, since it is larger than the sum of its proper divisors (175279).

2521045421 is a wasteful number, since it uses less digits than its factorization.

2521045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175278.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2521045421 is about 50210.0131547483. The cubic root of 2521045421 is about 1361.0065755024.

Adding to 2521045421 its reverse (1245401252), we get a palindrome (3766446673).

The spelling of 2521045421 in words is "two billion, five hundred twenty-one million, forty-five thousand, four hundred twenty-one".