21401682 has 16 divisors (see below), whose sum is σ = 42910560. Its totient is φ = 7116032.

The previous prime is 21401663. The next prime is 21401693. The reversal of 21401682 is 28610412.

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, 1743 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (2681910).

Almost surely, 2^21401682 is an apocalyptic number.

21401682 is an abundant number, since it is smaller than the sum of its proper divisors (21508878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21401682 is a wasteful number, since it uses less digits than its factorization.

21401682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21401682 is about 4626.1951969194. The cubic root of 21401682 is about 277.6403834785.

The spelling of 21401682 in words is "twenty-one million, four hundred one thousand, six hundred eighty-two".