121231312013 has 8 divisors (see below), whose sum is σ = 138906243840. Its totient is φ = 103645423440.

The previous prime is 121231311983. The next prime is 121231312031. The reversal of 121231312013 is 310213132121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121231312013 - 2¹² = 121231307917 is a prime.

It is a super-2 number, since 2×121231312013² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231312613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22257893 + ... + 22263338.

It is an arithmetic number, because the mean of its divisors is an integer number (17363280480).

Almost surely, 2^121231312013 is an apocalyptic number.

It is an amenable number.

121231312013 is a deficient number, since it is larger than the sum of its proper divisors (17674931827).

121231312013 is an equidigital number, since it uses as much as digits as its factorization.

121231312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44521627.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121231312013 its reverse (310213132121), we get a palindrome (431444444134).

The spelling of 121231312013 in words is "one hundred twenty-one billion, two hundred thirty-one million, three hundred twelve thousand, thirteen".