21917346 has 16 divisors (see below), whose sum is σ = 47819808. Its totient is φ = 6641600.

The previous prime is 21917339. The next prime is 21917347. The reversal of 21917346 is 64371912.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21917347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165975 + ... + 166106.

It is an arithmetic number, because the mean of its divisors is an integer number (2988738).

Almost surely, 2^21917346 is an apocalyptic number.

21917346 is an abundant number, since it is smaller than the sum of its proper divisors (25902462).

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

21917346 is a wasteful number, since it uses less digits than its factorization.

21917346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332097.

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

The square root of 21917346 is about 4681.5965225551. The cubic root of 21917346 is about 279.8525839658.

The spelling of 21917346 in words is "twenty-one million, nine hundred seventeen thousand, three hundred forty-six".