21224220234 has 32 divisors (see below), whose sum is σ = 48656489856. Its totient is φ = 6046064640.

The previous prime is 21224220233. The next prime is 21224220247. The reversal of 21224220234 is 43202242212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21224220233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 735607 + ... + 763914.

It is an arithmetic number, because the mean of its divisors is an integer number (1520515308).

Almost surely, 2^21224220234 is an apocalyptic number.

21224220234 is an abundant number, since it is smaller than the sum of its proper divisors (27432269622).

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

21224220234 is a wasteful number, since it uses less digits than its factorization.

21224220234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499870.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21224220234 its reverse (43202242212), we get a palindrome (64426462446).

The spelling of 21224220234 in words is "twenty-one billion, two hundred twenty-four million, two hundred twenty thousand, two hundred thirty-four".