121221231 has 4 divisors (see below), whose sum is σ = 161628312. Its totient is φ = 80814152.

The previous prime is 121221227. The next prime is 121221241. The reversal of 121221231 is 132122121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132122121 = 3 ⋅44040707.

It is a cyclic number.

It is not a de Polignac number, because 121221231 - 2² = 121221227 is a prime.

It is a super-2 number, since 2×121221231² = 29389173690310722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121221231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20203536 + ... + 20203541.

It is an arithmetic number, because the mean of its divisors is an integer number (40407078).

Almost surely, 2^121221231 is an apocalyptic number.

121221231 is a deficient number, since it is larger than the sum of its proper divisors (40407081).

121221231 is an equidigital number, since it uses as much as digits as its factorization.

121221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40407080.

The product of its digits is 48, while the sum is 15.

The square root of 121221231 is about 11010.0513622780. The cubic root of 121221231 is about 494.9100009829.

Adding to 121221231 its reverse (132122121), we get a palindrome (253343352).

The spelling of 121221231 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".