211430112221 has 4 divisors (see below), whose sum is σ = 212652251772. Its totient is φ = 210207972672.

The previous prime is 211430112203. The next prime is 211430112233. The reversal of 211430112221 is 122211034112.

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 195793860196 + 15636252025 = 442486^2 + 125045^2 .

It is a cyclic number.

It is not a de Polignac number, because 211430112221 - 2³⁴ = 194250243037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211430112193 and 211430112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211430112121) 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, 611069516 + ... + 611069861.

It is an arithmetic number, because the mean of its divisors is an integer number (53163062943).

Almost surely, 2^211430112221 is an apocalyptic number.

It is an amenable number.

211430112221 is a deficient number, since it is larger than the sum of its proper divisors (1222139551).

211430112221 is a wasteful number, since it uses less digits than its factorization.

211430112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222139550.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 211430112221 its reverse (122211034112), we get a palindrome (333641146333).

The spelling of 211430112221 in words is "two hundred eleven billion, four hundred thirty million, one hundred twelve thousand, two hundred twenty-one".