121231247 has 2 divisors, whose sum is σ = 121231248. Its totient is φ = 121231246.

The previous prime is 121231241. The next prime is 121231291. The reversal of 121231247 is 742132121.

121231247 is nontrivially palindromic in base 8.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121231247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121231241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615623 + 60615624.

It is an arithmetic number, because the mean of its divisors is an integer number (60615624).

Almost surely, 2^121231247 is an apocalyptic number.

121231247 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231247 is an equidigital number, since it uses as much as digits as its factorization.

121231247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 121231247 is about 11010.5062099796. The cubic root of 121231247 is about 494.9236313841.

Adding to 121231247 its reverse (742132121), we get a palindrome (863363368).

The spelling of 121231247 in words is "one hundred twenty-one million, two hundred thirty-one thousand, two hundred forty-seven".