21347408 has 20 divisors (see below), whose sum is σ = 41434848. Its totient is φ = 10654560.

The previous prime is 21347371. The next prime is 21347419. The reversal of 21347408 is 80474312.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 13373 + ... + 14883.

Almost surely, 2^21347408 is an apocalyptic number.

It is an amenable number.

21347408 is a deficient number, since it is larger than the sum of its proper divisors (20087440).

21347408 is a wasteful number, since it uses less digits than its factorization.

21347408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 2396 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21347408 is about 4620.3255296570. The cubic root of 21347408 is about 277.4054890120.

The spelling of 21347408 in words is "twenty-one million, three hundred forty-seven thousand, four hundred eight".