21946342 has 16 divisors (see below), whose sum is σ = 36251712. Its totient is φ = 9881320.

The previous prime is 21946333. The next prime is 21946369. The reversal of 21946342 is 24364912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2308 + ... + 7015.

It is an arithmetic number, because the mean of its divisors is an integer number (2265732).

Almost surely, 2^21946342 is an apocalyptic number.

21946342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21946342 is a deficient number, since it is larger than the sum of its proper divisors (14305370).

21946342 is a wasteful number, since it uses less digits than its factorization.

21946342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9443.

The product of its digits is 10368, while the sum is 31.

The square root of 21946342 is about 4684.6923057977. The cubic root of 21946342 is about 279.9759418105.

The spelling of 21946342 in words is "twenty-one million, nine hundred forty-six thousand, three hundred forty-two".