121231131113213 has 4 divisors (see below), whose sum is σ = 132252143032608. Its totient is φ = 110210119193820.

The previous prime is 121231131113207. The next prime is 121231131113299. The reversal of 121231131113213 is 312311131132121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121231131113213 - 2¹⁸ = 121231130851069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231131613213) 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, 5510505959681 + ... + 5510505959702.

It is an arithmetic number, because the mean of its divisors is an integer number (33063035758152).

Almost surely, 2^{121231131113213} is an apocalyptic number.

It is an amenable number.

121231131113213 is a deficient number, since it is larger than the sum of its proper divisors (11021011919395).

121231131113213 is a wasteful number, since it uses less digits than its factorization.

121231131113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11021011919394.

The product of its digits is 648, while the sum is 26.

Adding to 121231131113213 its reverse (312311131132121), we get a palindrome (433542262245334).

The spelling of 121231131113213 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, one hundred thirty-one million, one hundred thirteen thousand, two hundred thirteen".