211122202221 has 48 divisors (see below), whose sum is σ = 361711459200. Its totient is φ = 120546413568.

The previous prime is 211122202219. The next prime is 211122202223. The reversal of 211122202221 is 122202221112.

It is a happy number.

211122202221 is a `hidden beast` number, since 211 + 12 + 220 + 2 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (211122202219) and next prime (211122202223).

It is not a de Polignac number, because 211122202221 - 2¹ = 211122202219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122202194 and 211122202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122202223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2144445 + ... + 2240733.

It is an arithmetic number, because the mean of its divisors is an integer number (7535655400).

Almost surely, 2^211122202221 is an apocalyptic number.

211122202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211122202221 is a deficient number, since it is larger than the sum of its proper divisors (150589256979).

211122202221 is an equidigital number, since it uses as much as digits as its factorization.

211122202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97600 (or 97588 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211122202221 its reverse (122202221112), we get a palindrome (333324423333).

The spelling of 211122202221 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred two thousand, two hundred twenty-one".