25221155205 has 32 divisors (see below), whose sum is σ = 43119648000. Its totient is φ = 12543869952.

The previous prime is 25221155189. The next prime is 25221155279. The reversal of 25221155205 is 50255112252.

It is not a de Polignac number, because 25221155205 - 2⁴ = 25221155189 is a prime.

It is a super-2 number, since 2×25221155205² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425905 + ... + 481494.

It is an arithmetic number, because the mean of its divisors is an integer number (1347489000).

Almost surely, 2^25221155205 is an apocalyptic number.

It is an amenable number.

25221155205 is a deficient number, since it is larger than the sum of its proper divisors (17898492795).

25221155205 is a wasteful number, since it uses less digits than its factorization.

25221155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907533.

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 25221155205 its reverse (50255112252), we get a palindrome (75476267457).

The spelling of 25221155205 in words is "twenty-five billion, two hundred twenty-one million, one hundred fifty-five thousand, two hundred five".