221224313025 has 24 divisors (see below), whose sum is σ = 406397257760. Its totient is φ = 117986299920.

The previous prime is 221224312999. The next prime is 221224313059. The reversal of 221224313025 is 520313422122.

221224313025 is a `hidden beast` number, since 221 + 2 + 2 + 431 + 3 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 221224313025 - 2¹¹ = 221224310977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 221224313025.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163869187 + ... + 163870536.

Almost surely, 2^221224313025 is an apocalyptic number.

221224313025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221224313025 is a deficient number, since it is larger than the sum of its proper divisors (185172944735).

221224313025 is a wasteful number, since it uses less digits than its factorization.

221224313025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327739742 (or 327739731 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 221224313025 its reverse (520313422122), we get a palindrome (741537735147).

The spelling of 221224313025 in words is "two hundred twenty-one billion, two hundred twenty-four million, three hundred thirteen thousand, twenty-five".