21211222230 has 48 divisors (see below), whose sum is σ = 60162742224. Its totient is φ = 5142114240.

The previous prime is 21211222217. The next prime is 21211222231. The reversal of 21211222230 is 3222211212.

21211222230 is a `hidden beast` number, since 2 + 1 + 211 + 222 + 230 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10711749 + ... + 10713728.

It is an arithmetic number, because the mean of its divisors is an integer number (1253390463).

Almost surely, 2^21211222230 is an apocalyptic number.

21211222230 is an abundant number, since it is smaller than the sum of its proper divisors (38951519994).

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

21211222230 is a wasteful number, since it uses less digits than its factorization.

21211222230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21425501 (or 21425498 counting only the distinct ones).

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

Adding to 21211222230 its reverse (3222211212), we get a palindrome (24433433442).

The spelling of 21211222230 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred thirty".