21701406 has 8 divisors (see below), whose sum is σ = 43402824. Its totient is φ = 7233800.

The previous prime is 21701389. The next prime is 21701413. The reversal of 21701406 is 60410712.

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

21701406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1808445 + ... + 1808456.

It is an arithmetic number, because the mean of its divisors is an integer number (5425353).

Almost surely, 2^21701406 is an apocalyptic number.

21701406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21701406 is a wasteful number, since it uses less digits than its factorization.

21701406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616906.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21701406 is about 4658.4767896814. The cubic root of 21701406 is about 278.9304691779.

The spelling of 21701406 in words is "twenty-one million, seven hundred one thousand, four hundred six".