212220013121 has 8 divisors (see below), whose sum is σ = 217443594984. Its totient is φ = 206998692480.

The previous prime is 212220013097. The next prime is 212220013127. The reversal of 212220013121 is 121310022212.

It can be written as a sum of positive squares in 4 ways, for example, as 12174032896 + 200045980225 = 110336^2 + 447265^2 .

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 212220013121 - 2¹⁰ = 212220012097 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 212220013121.

It is not an unprimeable number, because it can be changed into a prime (212220013127) 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, 374510 + ... + 751463.

It is an arithmetic number, because the mean of its divisors is an integer number (27180449373).

Almost surely, 2^212220013121 is an apocalyptic number.

It is an amenable number.

212220013121 is a deficient number, since it is larger than the sum of its proper divisors (5223581863).

212220013121 is a wasteful number, since it uses less digits than its factorization.

212220013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130611.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212220013121 its reverse (121310022212), we get a palindrome (333530035333).

Subtracting from 212220013121 its reverse (121310022212), we obtain a palindrome (90909990909).

The spelling of 212220013121 in words is "two hundred twelve billion, two hundred twenty million, thirteen thousand, one hundred twenty-one".