211211000222221 has 4 divisors (see below), whose sum is σ = 213148715820700. Its totient is φ = 209273284623744.

The previous prime is 211211000222149. The next prime is 211211000222263. The reversal of 211211000222221 is 122222000112112.

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 193413688655625 + 17797311566596 = 13907325^2 + 4218686^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211000222221 - 2³⁷ = 211073561268749 is a prime.

It is a super-2 number, since 2×211211000222221² (a number of 29 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 (211211000220221) 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, 968857799076 + ... + 968857799293.

It is an arithmetic number, because the mean of its divisors is an integer number (53287178955175).

Almost surely, 2^{211211000222221} is an apocalyptic number.

It is an amenable number.

211211000222221 is a deficient number, since it is larger than the sum of its proper divisors (1937715598479).

211211000222221 is a wasteful number, since it uses less digits than its factorization.

211211000222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937715598478.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211211000222221 its reverse (122222000112112), we get a palindrome (333433000334333).

The spelling of 211211000222221 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-two thousand, two hundred twenty-one".