211221000234 has 48 divisors (see below), whose sum is σ = 472031873352. Its totient is φ = 68210049024.

The previous prime is 211221000217. The next prime is 211221000253. The reversal of 211221000234 is 432000122112.

It is a happy number.

211221000234 is a `hidden beast` number, since 211 + 221 + 0 + 0 + 0 + 234 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 199404223209 + 11816777025 = 446547^2 + 108705^2 .

It is a super-2 number, since 2×211221000234² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 525399 + ... + 835754.

Almost surely, 2^211221000234 is an apocalyptic number.

211221000234 is an abundant number, since it is smaller than the sum of its proper divisors (260810873118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221000234 is a wasteful number, since it uses less digits than its factorization.

211221000234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361431 (or 1361428 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 211221000234 its reverse (432000122112), we get a palindrome (643221122346).

The spelling of 211221000234 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thirty-four", and thus it is an aban number.