2521321421 has 4 divisors (see below), whose sum is σ = 2558953152. Its totient is φ = 2483689692.

The previous prime is 2521321379. The next prime is 2521321457. The reversal of 2521321421 is 1241231252.

2521321421 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521321421 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 (2521321471) 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, 18815765 + ... + 18815898.

It is an arithmetic number, because the mean of its divisors is an integer number (639738288).

Almost surely, 2^2521321421 is an apocalyptic number.

It is an amenable number.

2521321421 is a deficient number, since it is larger than the sum of its proper divisors (37631731).

2521321421 is an equidigital number, since it uses as much as digits as its factorization.

2521321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37631730.

The product of its digits is 960, while the sum is 23.

The square root of 2521321421 is about 50212.7615352910. The cubic root of 2521321421 is about 1361.0562406273.

Adding to 2521321421 its reverse (1241231252), we get a palindrome (3762552673).

The spelling of 2521321421 in words is "two billion, five hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty-one".