212011121001221 has 4 divisors (see below), whose sum is σ = 215486713148844. Its totient is φ = 208535528853600.

The previous prime is 212011121001217. The next prime is 212011121001233. The reversal of 212011121001221 is 122100121110212.

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 9834401920225 + 202176719080996 = 3135985^2 + 14218886^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011121001221 - 2² = 212011121001217 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 212011121001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011121009221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1737796073720 + ... + 1737796073841.

It is an arithmetic number, because the mean of its divisors is an integer number (53871678287211).

Almost surely, 2^{212011121001221} is an apocalyptic number.

It is an amenable number.

212011121001221 is a deficient number, since it is larger than the sum of its proper divisors (3475592147623).

212011121001221 is an equidigital number, since it uses as much as digits as its factorization.

212011121001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475592147622.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212011121001221 its reverse (122100121110212), we get a palindrome (334111242111433).

The spelling of 212011121001221 in words is "two hundred twelve trillion, eleven billion, one hundred twenty-one million, one thousand, two hundred twenty-one".