21534222 has 16 divisors (see below), whose sum is σ = 44232912. Its totient is φ = 6984000.

The previous prime is 21534221. The next prime is 21534241. The reversal of 21534222 is 22243512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48279 + ... + 48722.

It is an arithmetic number, because the mean of its divisors is an integer number (2764557).

Almost surely, 2^21534222 is an apocalyptic number.

21534222 is an abundant number, since it is smaller than the sum of its proper divisors (22698690).

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

21534222 is a wasteful number, since it uses less digits than its factorization.

21534222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97043.

The product of its digits is 960, while the sum is 21.

The square root of 21534222 is about 4640.4980336167. The cubic root of 21534222 is about 278.2123440185.

Adding to 21534222 its reverse (22243512), we get a palindrome (43777734).

The spelling of 21534222 in words is "twenty-one million, five hundred thirty-four thousand, two hundred twenty-two".