21917343 has 8 divisors (see below), whose sum is σ = 33397888. Its totient is φ = 12524184.

The previous prime is 21917339. The next prime is 21917347. The reversal of 21917343 is 34371912.

It is an interprime number because it is at equal distance from previous prime (21917339) and next prime (21917347).

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

It is not a de Polignac number, because 21917343 - 2² = 21917339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21917343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917347) 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, 521821 + ... + 521862.

It is an arithmetic number, because the mean of its divisors is an integer number (4174736).

Almost surely, 2^21917343 is an apocalyptic number.

21917343 is a deficient number, since it is larger than the sum of its proper divisors (11480545).

21917343 is a wasteful number, since it uses less digits than its factorization.

21917343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043693.

The product of its digits is 4536, while the sum is 30.

The square root of 21917343 is about 4681.5962021516. The cubic root of 21917343 is about 279.8525711972.

The spelling of 21917343 in words is "twenty-one million, nine hundred seventeen thousand, three hundred forty-three".