222221025 has 144 divisors (see below), whose sum is σ = 469188720. Its totient is φ = 99532800.

The previous prime is 222220993. The next prime is 222221047. The reversal of 222221025 is 520122222.

It can be written as a sum of positive squares in 24 ways, for example, as 186076881 + 36144144 = 13641^2 + 6012^2 .

It is not a de Polignac number, because 222221025 - 2⁵ = 222220993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222220989 and 222221007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2038671 + ... + 2038779.

It is an arithmetic number, because the mean of its divisors is an integer number (3258255).

Almost surely, 2^222221025 is an apocalyptic number.

222221025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

222221025 is an abundant number, since it is smaller than the sum of its proper divisors (246967695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222221025 is a wasteful number, since it uses less digits than its factorization.

222221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 222221025 is about 14907.0796938904. The cubic root of 222221025 is about 605.7057765268.

Adding to 222221025 its reverse (520122222), we get a palindrome (742343247).

The spelling of 222221025 in words is "two hundred twenty-two million, two hundred twenty-one thousand, twenty-five".