221325121 has 8 divisors (see below), whose sum is σ = 222453000. Its totient is φ = 220200960.

The previous prime is 221325119. The next prime is 221325131. The reversal of 221325121 is 121523122.

It can be written as a sum of positive squares in 4 ways, for example, as 76387600 + 144937521 = 8740^2 + 12039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221325121 - 2¹ = 221325119 is a prime.

It is a deceptive number, since it divides R_221325120.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221325131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287425 + ... + 288193.

It is an arithmetic number, because the mean of its divisors is an integer number (27806625).

Almost surely, 2^221325121 is an apocalyptic number.

It is an amenable number.

221325121 is a deficient number, since it is larger than the sum of its proper divisors (1127879).

221325121 is an equidigital number, since it uses as much as digits as its factorization.

221325121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859.

The product of its digits is 240, while the sum is 19.

The square root of 221325121 is about 14876.9997311286. Note that the first 3 decimals coincide. The cubic root of 221325121 is about 604.8906944573.

Adding to 221325121 its reverse (121523122), we get a palindrome (342848243).

The spelling of 221325121 in words is "two hundred twenty-one million, three hundred twenty-five thousand, one hundred twenty-one".