2505024222221 has 4 divisors (see below), whose sum is σ = 2652378588252. Its totient is φ = 2357669856192.

The previous prime is 2505024222167. The next prime is 2505024222293. The reversal of 2505024222221 is 1222224205052.

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 1984013102500 + 521011119721 = 1408550^2 + 721811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505024222221 - 2²⁶ = 2504957113357 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 (2505024422221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73677182990 + ... + 73677183023.

It is an arithmetic number, because the mean of its divisors is an integer number (663094647063).

Almost surely, 2^{2505024222221} is an apocalyptic number.

It is an amenable number.

2505024222221 is a deficient number, since it is larger than the sum of its proper divisors (147354366031).

2505024222221 is a wasteful number, since it uses less digits than its factorization.

2505024222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147354366030.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 2505024222221 its reverse (1222224205052), we get a palindrome (3727248427273).

The spelling of 2505024222221 in words is "two trillion, five hundred five billion, twenty-four million, two hundred twenty-two thousand, two hundred twenty-one".