2523221421 has 16 divisors (see below), whose sum is σ = 3897581184. Its totient is φ = 1422088704.

The previous prime is 2523221383. The next prime is 2523221429. The reversal of 2523221421 is 1241223252.

It is not a de Polignac number, because 2523221421 - 2¹⁸ = 2522959277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2523221391 and 2523221400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523221429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 821436 + ... + 824501.

It is an arithmetic number, because the mean of its divisors is an integer number (243598824).

Almost surely, 2^2523221421 is an apocalyptic number.

2523221421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2523221421 is a deficient number, since it is larger than the sum of its proper divisors (1374359763).

2523221421 is a wasteful number, since it uses less digits than its factorization.

2523221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646020.

The product of its digits is 1920, while the sum is 24.

The square root of 2523221421 is about 50231.6774655197. The cubic root of 2523221421 is about 1361.3980399084.

Adding to 2523221421 its reverse (1241223252), we get a palindrome (3764444673).

The spelling of 2523221421 in words is "two billion, five hundred twenty-three million, two hundred twenty-one thousand, four hundred twenty-one".