21682610 has 32 divisors (see below), whose sum is σ = 41428800. Its totient is φ = 8147520.

The previous prime is 21682589. The next prime is 21682613. The reversal of 21682610 is 1628612.

It is a self number, because there is not a number n which added to its sum of digits gives 21682610.

It is not an unprimeable number, because it can be changed into a prime (21682613) 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 15 ways as a sum of consecutive naturals, for example, 26000 + ... + 26820.

It is an arithmetic number, because the mean of its divisors is an integer number (1294650).

Almost surely, 2^21682610 is an apocalyptic number.

21682610 is a deficient number, since it is larger than the sum of its proper divisors (19746190).

21682610 is a wasteful number, since it uses less digits than its factorization.

21682610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21682610 is about 4656.4589550430. The cubic root of 21682610 is about 278.8499169247.

The spelling of 21682610 in words is "twenty-one million, six hundred eighty-two thousand, six hundred ten".