212021011221 has 4 divisors (see below), whose sum is σ = 282694681632. Its totient is φ = 141347340812.

The previous prime is 212021011177. The next prime is 212021011259. The reversal of 212021011221 is 122110120212.

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 not a de Polignac number, because 212021011221 - 2⁹ = 212021010709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021011271) 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, 35336835201 + ... + 35336835206.

It is an arithmetic number, because the mean of its divisors is an integer number (70673670408).

Almost surely, 2^212021011221 is an apocalyptic number.

It is an amenable number.

212021011221 is a deficient number, since it is larger than the sum of its proper divisors (70673670411).

212021011221 is an equidigital number, since it uses as much as digits as its factorization.

212021011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70673670410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212021011221 its reverse (122110120212), we get a palindrome (334131131433).

The spelling of 212021011221 in words is "two hundred twelve billion, twenty-one million, eleven thousand, two hundred twenty-one".