121121012231 has 2 divisors, whose sum is σ = 121121012232. Its totient is φ = 121121012230.

The previous prime is 121121012209. The next prime is 121121012249. The reversal of 121121012231 is 132210121121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121121012231 is a prime.

It is a super-2 number, since 2×121121012231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121121002231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560506115 + 60560506116.

It is an arithmetic number, because the mean of its divisors is an integer number (60560506116).

Almost surely, 2^121121012231 is an apocalyptic number.

121121012231 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121012231 is an equidigital number, since it uses as much as digits as its factorization.

121121012231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121121012231 its reverse (132210121121), we get a palindrome (253331133352).

The spelling of 121121012231 in words is "one hundred twenty-one billion, one hundred twenty-one million, twelve thousand, two hundred thirty-one".