1213012121111 has 8 divisors (see below), whose sum is σ = 1467846600480. Its totient is φ = 978564400128.

The previous prime is 1213012121081. The next prime is 1213012121117. The reversal of 1213012121111 is 1111212103121.

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

It is not a de Polignac number, because 1213012121111 - 2¹⁰ = 1213012120087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213012121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213012121117) 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, 5096689466 + ... + 5096689703.

It is an arithmetic number, because the mean of its divisors is an integer number (183480825060).

Almost surely, 2^{1213012121111} is an apocalyptic number.

1213012121111 is a deficient number, since it is larger than the sum of its proper divisors (254834479369).

1213012121111 is a wasteful number, since it uses less digits than its factorization.

1213012121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10193379193.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1213012121111 its reverse (1111212103121), we get a palindrome (2324224224232).

The spelling of 1213012121111 in words is "one trillion, two hundred thirteen billion, twelve million, one hundred twenty-one thousand, one hundred eleven".