121240221 has 8 divisors (see below), whose sum is σ = 164393760. Its totient is φ = 79456752.

The previous prime is 121240219. The next prime is 121240253. The reversal of 121240221 is 122042121.

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

It is not a de Polignac number, because 121240221 - 2¹ = 121240219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121240221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121240211) 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, 342310 + ... + 342663.

It is an arithmetic number, because the mean of its divisors is an integer number (20549220).

Almost surely, 2^121240221 is an apocalyptic number.

It is an amenable number.

121240221 is a deficient number, since it is larger than the sum of its proper divisors (43153539).

121240221 is an equidigital number, since it uses as much as digits as its factorization.

121240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685035.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 121240221 is about 11010.9137223030. The cubic root of 121240221 is about 494.9358431287.

Adding to 121240221 its reverse (122042121), we get a palindrome (243282342).

The spelling of 121240221 in words is "one hundred twenty-one million, two hundred forty thousand, two hundred twenty-one".