221212110025 has 24 divisors (see below), whose sum is σ = 280721697344. Its totient is φ = 172829764800.

The previous prime is 221212109999. The next prime is 221212110043. The reversal of 221212110025 is 520011212122.

It is a happy number.

It is not a de Polignac number, because 221212110025 - 2⁹ = 221212109513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221212109984 and 221212110011.

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, 13344292 + ... + 13360858.

Almost surely, 2^221212110025 is an apocalyptic number.

221212110025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221212110025 is a deficient number, since it is larger than the sum of its proper divisors (59509587319).

221212110025 is a wasteful number, since it uses less digits than its factorization.

221212110025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29041 (or 29036 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 221212110025 its reverse (520011212122), we get a palindrome (741223322147).

The spelling of 221212110025 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, twenty-five".