211222330021 has 4 divisors (see below), whose sum is σ = 211249152972. Its totient is φ = 211195507072.

The previous prime is 211222329991. The next prime is 211222330037. The reversal of 211222330021 is 120033222112.

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 55090661796 + 156131668225 = 234714^2 + 395135^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222330021 - 2¹³ = 211222321829 is a prime.

It is a super-2 number, since 2×211222330021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222330061) 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, 13399660 + ... + 13415413.

It is an arithmetic number, because the mean of its divisors is an integer number (52812288243).

Almost surely, 2^211222330021 is an apocalyptic number.

It is an amenable number.

211222330021 is a deficient number, since it is larger than the sum of its proper divisors (26822951).

211222330021 is an equidigital number, since it uses as much as digits as its factorization.

211222330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26822950.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 211222330021 its reverse (120033222112), we get a palindrome (331255552133).

The spelling of 211222330021 in words is "two hundred eleven billion, two hundred twenty-two million, three hundred thirty thousand, twenty-one".