221227625525 has 12 divisors (see below), whose sum is σ = 274340672100. Its totient is φ = 176970218880.

The previous prime is 221227625513. The next prime is 221227625533. The reversal of 221227625525 is 525526722122.

It can be written as a sum of positive squares in 6 ways, for example, as 11354607364 + 209873018161 = 106558^2 + 458119^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221227625525 is a prime.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 92831 + ... + 671619.

It is an arithmetic number, because the mean of its divisors is an integer number (22861722675).

Almost surely, 2^221227625525 is an apocalyptic number.

221227625525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221227625525 is a deficient number, since it is larger than the sum of its proper divisors (53113046575).

221227625525 is a wasteful number, since it uses less digits than its factorization.

221227625525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594088 (or 594083 counting only the distinct ones).

The product of its digits is 336000, while the sum is 41.

The spelling of 221227625525 in words is "two hundred twenty-one billion, two hundred twenty-seven million, six hundred twenty-five thousand, five hundred twenty-five".