21682606 has 32 divisors (see below), whose sum is σ = 37594368. Its totient is φ = 9282240.

The previous prime is 21682589. The next prime is 21682613. The reversal of 21682606 is 60628612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36645 + ... + 37231.

It is an arithmetic number, because the mean of its divisors is an integer number (1174824).

Almost surely, 2^21682606 is an apocalyptic number.

21682606 is a deficient number, since it is larger than the sum of its proper divisors (15911762).

21682606 is a wasteful number, since it uses less digits than its factorization.

21682606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21682606 is about 4656.4585255320. The cubic root of 21682606 is about 278.8498997774.

It can be divided in two parts, 2168 and 2606, that added together give a palindrome (4774).

The spelling of 21682606 in words is "twenty-one million, six hundred eighty-two thousand, six hundred six".