21713496 has 64 divisors (see below), whose sum is σ = 62388480. Its totient is φ = 6168960.

The previous prime is 21713491. The next prime is 21713501. The reversal of 21713496 is 69431712.

It is an interprime number because it is at equal distance from previous prime (21713491) and next prime (21713501).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51366 + ... + 51786.

It is an arithmetic number, because the mean of its divisors is an integer number (974820).

Almost surely, 2^21713496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21713496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31194240).

21713496 is an abundant number, since it is smaller than the sum of its proper divisors (40674984).

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

21713496 is a wasteful number, since it uses less digits than its factorization.

21713496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 740 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 21713496 is about 4659.7742434586. The cubic root of 21713496 is about 278.9822575786.

The spelling of 21713496 in words is "twenty-one million, seven hundred thirteen thousand, four hundred ninety-six".