21434534 has 16 divisors (see below), whose sum is σ = 35277120. Its totient is φ = 9686760.

The previous prime is 21434531. The next prime is 21434579. The reversal of 21434534 is 43543412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434531) 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, 1217 + ... + 6659.

It is an arithmetic number, because the mean of its divisors is an integer number (2204820).

Almost surely, 2^21434534 is an apocalyptic number.

21434534 is a deficient number, since it is larger than the sum of its proper divisors (13842586).

21434534 is a wasteful number, since it uses less digits than its factorization.

21434534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635.

The product of its digits is 5760, while the sum is 26.

The square root of 21434534 is about 4629.7444853901. The cubic root of 21434534 is about 277.7823719892.

Adding to 21434534 its reverse (43543412), we get a palindrome (64977946).

The spelling of 21434534 in words is "twenty-one million, four hundred thirty-four thousand, five hundred thirty-four".