21112534 has 8 divisors (see below), whose sum is σ = 33335640. Its totient is φ = 10000656.

The previous prime is 21112433. The next prime is 21112547. The reversal of 21112534 is 43521112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277759 + ... + 277834.

It is an arithmetic number, because the mean of its divisors is an integer number (4166955).

Almost surely, 2^21112534 is an apocalyptic number.

21112534 is a deficient number, since it is larger than the sum of its proper divisors (12223106).

21112534 is a wasteful number, since it uses less digits than its factorization.

21112534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555614.

The product of its digits is 240, while the sum is 19.

The square root of 21112534 is about 4594.8377555687. The cubic root of 21112534 is about 276.3843538845.

Adding to 21112534 its reverse (43521112), we get a palindrome (64633646).

The spelling of 21112534 in words is "twenty-one million, one hundred twelve thousand, five hundred thirty-four".