21682463 has 16 divisors (see below), whose sum is σ = 25588224. Its totient is φ = 18149760.

The previous prime is 21682433. The next prime is 21682487. The reversal of 21682463 is 36428612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21682463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21682403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7556 + ... + 10022.

It is an arithmetic number, because the mean of its divisors is an integer number (1599264).

Almost surely, 2^21682463 is an apocalyptic number.

21682463 is a deficient number, since it is larger than the sum of its proper divisors (3905761).

21682463 is a wasteful number, since it uses less digits than its factorization.

21682463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542.

The product of its digits is 13824, while the sum is 32.

The square root of 21682463 is about 4656.4431704897. The cubic root of 21682463 is about 278.8492867572.

The spelling of 21682463 in words is "twenty-one million, six hundred eighty-two thousand, four hundred sixty-three".