212021112011221 has 4 divisors (see below), whose sum is σ = 212021337204000. Its totient is φ = 212020886818444.

The previous prime is 212021112011119. The next prime is 212021112011239. The reversal of 212021112011221 is 122110211120212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021112011221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021112021221) 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, 111178171 + ... + 113069128.

It is an arithmetic number, because the mean of its divisors is an integer number (53005334301000).

Almost surely, 2^{212021112011221} is an apocalyptic number.

It is an amenable number.

212021112011221 is a deficient number, since it is larger than the sum of its proper divisors (225192779).

212021112011221 is an equidigital number, since it uses as much as digits as its factorization.

212021112011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225192778.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212021112011221 its reverse (122110211120212), we get a palindrome (334131323131433).

The spelling of 212021112011221 in words is "two hundred twelve trillion, twenty-one billion, one hundred twelve million, eleven thousand, two hundred twenty-one".