1213112012021 has 16 divisors (see below), whose sum is σ = 1495247048064. Its totient is φ = 958419532224.

The previous prime is 1213112011999. The next prime is 1213112012071. The reversal of 1213112012021 is 1202102113121.

It is a happy number.

It is not a de Polignac number, because 1213112012021 - 2³⁸ = 938234105077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213112012071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9696926 + ... + 9821231.

It is an arithmetic number, because the mean of its divisors is an integer number (93452940504).

Almost surely, 2^{1213112012021} is an apocalyptic number.

It is an amenable number.

1213112012021 is a deficient number, since it is larger than the sum of its proper divisors (282135036043).

1213112012021 is a wasteful number, since it uses less digits than its factorization.

1213112012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19518860.

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

Adding to 1213112012021 its reverse (1202102113121), we get a palindrome (2415214125142).

The spelling of 1213112012021 in words is "one trillion, two hundred thirteen billion, one hundred twelve million, twelve thousand, twenty-one".