21676534 has 16 divisors (see below), whose sum is σ = 37013760. Its totient is φ = 9424360.

The previous prime is 21676531. The next prime is 21676537. The reversal of 21676534 is 43567612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21676531) and next prime (21676537).

It is a self number, because there is not a number n which added to its sum of digits gives 21676534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20914 + ... + 21925.

It is an arithmetic number, because the mean of its divisors is an integer number (2313360).

Almost surely, 2^21676534 is an apocalyptic number.

21676534 is a deficient number, since it is larger than the sum of its proper divisors (15337226).

21676534 is a wasteful number, since it uses less digits than its factorization.

21676534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42875.

The product of its digits is 30240, while the sum is 34.

The square root of 21676534 is about 4655.8064822327. The cubic root of 21676534 is about 278.8238676256.

The spelling of 21676534 in words is "twenty-one million, six hundred seventy-six thousand, five hundred thirty-four".