1213012021121 has 8 divisors (see below), whose sum is σ = 1215014097024. Its totient is φ = 1211010863040.

The previous prime is 1213012021061. The next prime is 1213012021127. The reversal of 1213012021121 is 1211202103121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1213012021121 - 2³⁰ = 1211938279297 is a prime.

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 1213012021121.

It is not an unprimeable number, because it can be changed into a prime (1213012021127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441561 + ... + 2896073.

It is an arithmetic number, because the mean of its divisors is an integer number (151876762128).

Almost surely, 2^{1213012021121} is an apocalyptic number.

It is an amenable number.

1213012021121 is a deficient number, since it is larger than the sum of its proper divisors (2002075903).

1213012021121 is an equidigital number, since it uses as much as digits as its factorization.

1213012021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458911.

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

Adding to 1213012021121 its reverse (1211202103121), we get a palindrome (2424214124242).

The spelling of 1213012021121 in words is "one trillion, two hundred thirteen billion, twelve million, twenty-one thousand, one hundred twenty-one".