21412534 has 16 divisors (see below), whose sum is σ = 37734480. Its totient is φ = 8984160.

The previous prime is 21412513. The next prime is 21412549. The reversal of 21412534 is 43521412.

It is a super-2 number, since 2×21412534² = 916993224602312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37149 + ... + 37720.

It is an arithmetic number, because the mean of its divisors is an integer number (2358405).

Almost surely, 2^21412534 is an apocalyptic number.

21412534 is a deficient number, since it is larger than the sum of its proper divisors (16321946).

21412534 is a wasteful number, since it uses less digits than its factorization.

21412534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74895.

The product of its digits is 960, while the sum is 22.

The square root of 21412534 is about 4627.3679343661. The cubic root of 21412534 is about 277.6873025997.

Adding to 21412534 its reverse (43521412), we get a palindrome (64933946).

The spelling of 21412534 in words is "twenty-one million, four hundred twelve thousand, five hundred thirty-four".