121222831 has 4 divisors (see below), whose sum is σ = 127603000. Its totient is φ = 114842664.

The previous prime is 121222789. The next prime is 121222837. The reversal of 121222831 is 138222121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121222831 is a prime.

It is a super-2 number, since 2×121222831² = 29389949511309122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222837) 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, 3190056 + ... + 3190093.

It is an arithmetic number, because the mean of its divisors is an integer number (31900750).

Almost surely, 2^121222831 is an apocalyptic number.

121222831 is a deficient number, since it is larger than the sum of its proper divisors (6380169).

121222831 is an equidigital number, since it uses as much as digits as its factorization.

121222831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6380168.

The product of its digits is 384, while the sum is 22.

The square root of 121222831 is about 11010.1240229164. The cubic root of 121222831 is about 494.9121784137.

Adding to 121222831 its reverse (138222121), we get a palindrome (259444952).

The spelling of 121222831 in words is "one hundred twenty-one million, two hundred twenty-two thousand, eight hundred thirty-one".