221431350274025 has 6 divisors (see below), whose sum is σ = 274574874339822. Its totient is φ = 177145080219200.

The previous prime is 221431350273937. The next prime is 221431350274067. The reversal of 221431350274025 is 520472053134122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 44077861261456 + 177353489012569 = 6639116^2 + 13317413^2 .

It is not a de Polignac number, because 221431350274025 - 2²² = 221431346079721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4428627005456 + ... + 4428627005505.

It is an arithmetic number, because the mean of its divisors is an integer number (45762479056637).

Almost surely, 2^{221431350274025} is an apocalyptic number.

221431350274025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221431350274025 is a deficient number, since it is larger than the sum of its proper divisors (53143524065797).

221431350274025 is an equidigital number, since it uses as much as digits as its factorization.

221431350274025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8857254010971 (or 8857254010966 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 221431350274025 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, three hundred fifty million, two hundred seventy-four thousand, twenty-five".