221551041025 has 24 divisors (see below), whose sum is σ = 283669455104. Its totient is φ = 171472507200.

The previous prime is 221551040993. The next prime is 221551041053. The reversal of 221551041025 is 520140155122.

It is not a de Polignac number, because 221551041025 - 2⁵ = 221551040993 is a prime.

It is a super-2 number, since 2×221551041025² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221551040984 and 221551041002.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2685034 + ... + 2766316.

Almost surely, 2^221551041025 is an apocalyptic number.

221551041025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221551041025 is a deficient number, since it is larger than the sum of its proper divisors (62118414079).

221551041025 is a wasteful number, since it uses less digits than its factorization.

221551041025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84841 (or 84836 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 221551041025 its reverse (520140155122), we get a palindrome (741691196147).

The spelling of 221551041025 in words is "two hundred twenty-one billion, five hundred fifty-one million, forty-one thousand, twenty-five".