21401683 has 8 divisors (see below), whose sum is σ = 21664256. Its totient is φ = 21141000.

The previous prime is 21401663. The next prime is 21401693. The reversal of 21401683 is 38610412.

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

It is a cyclic number.

It is not a de Polignac number, because 21401683 - 2²¹ = 19304531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40660 + ... + 41182.

It is an arithmetic number, because the mean of its divisors is an integer number (2708032).

Almost surely, 2^21401683 is an apocalyptic number.

21401683 is a deficient number, since it is larger than the sum of its proper divisors (262573).

21401683 is a wasteful number, since it uses less digits than its factorization.

21401683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21401683 is about 4626.1953049996. The cubic root of 21401683 is about 277.6403878028.

The spelling of 21401683 in words is "twenty-one million, four hundred one thousand, six hundred eighty-three".