121211212013 has 4 divisors (see below), whose sum is σ = 121464263040. Its totient is φ = 120958160988.

The previous prime is 121211211997. The next prime is 121211212051. The reversal of 121211212013 is 310212112121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 310212112121 = 61 ⋅5085444461.

It is a cyclic number.

It is not a de Polignac number, because 121211212013 - 2⁴ = 121211211997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211211982 and 121211212000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211212093) 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, 126524795 + ... + 126525752.

It is an arithmetic number, because the mean of its divisors is an integer number (30366065760).

Almost surely, 2^121211212013 is an apocalyptic number.

It is an amenable number.

121211212013 is a deficient number, since it is larger than the sum of its proper divisors (253051027).

121211212013 is an equidigital number, since it uses as much as digits as its factorization.

121211212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253051026.

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

Adding to 121211212013 its reverse (310212112121), we get a palindrome (431423324134).

The spelling of 121211212013 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, thirteen".