2500421221 has 4 divisors (see below), whose sum is σ = 2500541932. Its totient is φ = 2500300512.

The previous prime is 2500421213. The next prime is 2500421243. The reversal of 2500421221 is 1221240052.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1060218721 + 1440202500 = 32561^2 + 37950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500421221 - 2³ = 2500421213 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 (2500421321) 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, 20520 + ... + 73633.

It is an arithmetic number, because the mean of its divisors is an integer number (625135483).

Almost surely, 2^2500421221 is an apocalyptic number.

It is an amenable number.

2500421221 is a deficient number, since it is larger than the sum of its proper divisors (120711).

2500421221 is an equidigital number, since it uses as much as digits as its factorization.

2500421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120710.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 2500421221 is about 50004.2120325878. The cubic root of 2500421221 is about 1357.2850286637.

Adding to 2500421221 its reverse (1221240052), we get a palindrome (3721661273).

It can be divided in two parts, 25004 and 21221, that added together give a square (46225 = 215²).

The spelling of 2500421221 in words is "two billion, five hundred million, four hundred twenty-one thousand, two hundred twenty-one".