1213011120121 has 4 divisors (see below), whose sum is σ = 1221152134500. Its totient is φ = 1204870105744.

The previous prime is 1213011120107. The next prime is 1213011120161. The reversal of 1213011120121 is 1210211103121.

It is a happy number.

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 394963228521 + 818047891600 = 628461^2 + 904460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213011120121 - 2²¹ = 1213009022969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213011120095 and 1213011120104.

It is not an unprimeable number, because it can be changed into a prime (1213011120161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4070506966 + ... + 4070507263.

It is an arithmetic number, because the mean of its divisors is an integer number (305288033625).

Almost surely, 2^{1213011120121} is an apocalyptic number.

It is an amenable number.

1213011120121 is a deficient number, since it is larger than the sum of its proper divisors (8141014379).

1213011120121 is an equidigital number, since it uses as much as digits as its factorization.

1213011120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8141014378.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1213011120121 its reverse (1210211103121), we get a palindrome (2423222223242).

The spelling of 1213011120121 in words is "one trillion, two hundred thirteen billion, eleven million, one hundred twenty thousand, one hundred twenty-one".