121131110213 has 4 divisors (see below), whose sum is σ = 121474258188. Its totient is φ = 120787962240.

The previous prime is 121131110197. The next prime is 121131110249. The reversal of 121131110213 is 312011131121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25249845604 + 95881264609 = 158902^2 + 309647^2 .

It is a cyclic number.

It is not a de Polignac number, because 121131110213 - 2⁴ = 121131110197 is a prime.

It is a super-2 number, since 2×121131110213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121131110191 and 121131110200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131110263) 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, 171573458 + ... + 171574163.

It is an arithmetic number, because the mean of its divisors is an integer number (30368564547).

Almost surely, 2^121131110213 is an apocalyptic number.

It is an amenable number.

121131110213 is a deficient number, since it is larger than the sum of its proper divisors (343147975).

121131110213 is an equidigital number, since it uses as much as digits as its factorization.

121131110213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343147974.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 121131110213 its reverse (312011131121), we get a palindrome (433142241334).

The spelling of 121131110213 in words is "one hundred twenty-one billion, one hundred thirty-one million, one hundred ten thousand, two hundred thirteen".