21223434 has 32 divisors (see below), whose sum is σ = 44717184. Its totient is φ = 6702080.

The previous prime is 21223427. The next prime is 21223453. The reversal of 21223434 is 43432212.

It is a self number, because there is not a number n which added to its sum of digits gives 21223434.

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, 14914 + ... + 16274.

It is an arithmetic number, because the mean of its divisors is an integer number (1397412).

Almost surely, 2^21223434 is an apocalyptic number.

21223434 is an abundant number, since it is smaller than the sum of its proper divisors (23493750).

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

21223434 is a wasteful number, since it uses less digits than its factorization.

21223434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502.

The product of its digits is 1152, while the sum is 21.

The square root of 21223434 is about 4606.8898402284. The cubic root of 21223434 is about 276.8674399504.

Adding to 21223434 its reverse (43432212), we get a palindrome (64655646).

The spelling of 21223434 in words is "twenty-one million, two hundred twenty-three thousand, four hundred thirty-four".