221211211230 has 48 divisors (see below), whose sum is σ = 608981456304. Its totient is φ = 55519676160.

The previous prime is 221211211129. The next prime is 221211211321. The reversal of 221211211230 is 32112112122.

221211211230 is a `hidden beast` number, since 2 + 212 + 11 + 211 + 230 = 666.

It is a super-2 number, since 2×221211211230² (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 a Curzon number.

It is a congruent number.

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, 72289716 + ... + 72292775.

It is an arithmetic number, because the mean of its divisors is an integer number (12687113673).

Almost surely, 2^221211211230 is an apocalyptic number.

221211211230 is an abundant number, since it is smaller than the sum of its proper divisors (387770245074).

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

221211211230 is a wasteful number, since it uses less digits than its factorization.

221211211230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144582521 (or 144582518 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221211211230 its reverse (32112112122), we get a palindrome (253323323352).

The spelling of 221211211230 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred thirty".