21475342 has 8 divisors (see below), whose sum is σ = 36814896. Its totient is φ = 9203712.

The previous prime is 21475331. The next prime is 21475357. The reversal of 21475342 is 24357412.

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

It is a super-2 number, since 2×21475342² = 922380628033928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21475342.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 766963 + ... + 766990.

It is an arithmetic number, because the mean of its divisors is an integer number (4601862).

Almost surely, 2^21475342 is an apocalyptic number.

21475342 is a deficient number, since it is larger than the sum of its proper divisors (15339554).

21475342 is a wasteful number, since it uses less digits than its factorization.

21475342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533962.

The product of its digits is 6720, while the sum is 28.

The square root of 21475342 is about 4634.1495444148. The cubic root of 21475342 is about 277.9585449633.

The spelling of 21475342 in words is "twenty-one million, four hundred seventy-five thousand, three hundred forty-two".