21201222234 has 32 divisors (see below), whose sum is σ = 42834718080. Its totient is φ = 6995160000.

The previous prime is 21201222209. The next prime is 21201222253. The reversal of 21201222234 is 43222210212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201222234.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651859 + ... + 683609.

It is an arithmetic number, because the mean of its divisors is an integer number (1338584940).

Almost surely, 2^21201222234 is an apocalyptic number.

21201222234 is an abundant number, since it is smaller than the sum of its proper divisors (21633495846).

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

21201222234 is a wasteful number, since it uses less digits than its factorization.

21201222234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32886.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21201222234 its reverse (43222210212), we get a palindrome (64423432446).

The spelling of 21201222234 in words is "twenty-one billion, two hundred one million, two hundred twenty-two thousand, two hundred thirty-four".