121343231231 has 4 divisors (see below), whose sum is σ = 122544649464. Its totient is φ = 120141813000.

The previous prime is 121343231221. The next prime is 121343231281. The reversal of 121343231231 is 132132343121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121343231231 - 2²² = 121339036927 is a prime.

It is a super-2 number, since 2×121343231231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121343231231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121343231221) 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, 600708965 + ... + 600709166.

It is an arithmetic number, because the mean of its divisors is an integer number (30636162366).

Almost surely, 2^121343231231 is an apocalyptic number.

121343231231 is a deficient number, since it is larger than the sum of its proper divisors (1201418233).

121343231231 is a wasteful number, since it uses less digits than its factorization.

121343231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201418232.

The product of its digits is 2592, while the sum is 26.

Adding to 121343231231 its reverse (132132343121), we get a palindrome (253475574352).

The spelling of 121343231231 in words is "one hundred twenty-one billion, three hundred forty-three million, two hundred thirty-one thousand, two hundred thirty-one".