211100222021 has 16 divisors (see below), whose sum is σ = 233318930544. Its totient is φ = 189789510144.

The previous prime is 211100222017. The next prime is 211100222033. The reversal of 211100222021 is 120222001112.

It can be written as a sum of positive squares in 8 ways, for example, as 318229921 + 210781992100 = 17839^2 + 459110^2 .

It is not a de Polignac number, because 211100222021 - 2² = 211100222017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211100221987 and 211100222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100222521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023806 + ... + 1212591.

It is an arithmetic number, because the mean of its divisors is an integer number (14582433159).

Almost surely, 2^211100222021 is an apocalyptic number.

It is an amenable number.

211100222021 is a deficient number, since it is larger than the sum of its proper divisors (22218708523).

211100222021 is a wasteful number, since it uses less digits than its factorization.

211100222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236600.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211100222021 its reverse (120222001112), we get a palindrome (331322223133).

The spelling of 211100222021 in words is "two hundred eleven billion, one hundred million, two hundred twenty-two thousand, twenty-one".