211221234430 has 32 divisors (see below), whose sum is σ = 387435506400. Its totient is φ = 82880733312.

The previous prime is 211221234397. The next prime is 211221234431. The reversal of 211221234430 is 34432122112.

211221234430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211221234430² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221234395 and 211221234404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221234431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3563476 + ... + 3622264.

It is an arithmetic number, because the mean of its divisors is an integer number (12107359575).

Almost surely, 2^211221234430 is an apocalyptic number.

211221234430 is a deficient number, since it is larger than the sum of its proper divisors (176214271970).

211221234430 is a wasteful number, since it uses less digits than its factorization.

211221234430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65628.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 211221234430 its reverse (34432122112), we get a palindrome (245653356542).

The spelling of 211221234430 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thirty-four thousand, four hundred thirty".