212021112221 has 8 divisors (see below), whose sum is σ = 221262385920. Its totient is φ = 202781752272.

The previous prime is 212021112203. The next prime is 212021112229. The reversal of 212021112221 is 122211120212.

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 212021112221 - 2¹⁸ = 212020850077 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 212021112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021112229) 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, 249701 + ... + 697418.

It is an arithmetic number, because the mean of its divisors is an integer number (27657798240).

Almost surely, 2^212021112221 is an apocalyptic number.

It is an amenable number.

212021112221 is a deficient number, since it is larger than the sum of its proper divisors (9241273699).

212021112221 is an equidigital number, since it uses as much as digits as its factorization.

212021112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956875.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212021112221 its reverse (122211120212), we get a palindrome (334232232433).

The spelling of 212021112221 in words is "two hundred twelve billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".