21349473 has 8 divisors (see below), whose sum is σ = 28488768. Its totient is φ = 14221584.

The previous prime is 21349459. The next prime is 21349511. The reversal of 21349473 is 37494312.

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

It is not a de Polignac number, because 21349473 - 2¹⁴ = 21333089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21349403) 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, 3615 + ... + 7467.

It is an arithmetic number, because the mean of its divisors is an integer number (3561096).

Almost surely, 2^21349473 is an apocalyptic number.

It is an amenable number.

21349473 is a deficient number, since it is larger than the sum of its proper divisors (7139295).

21349473 is a wasteful number, since it uses less digits than its factorization.

21349473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703.

The product of its digits is 18144, while the sum is 33.

The square root of 21349473 is about 4620.5489933557. The cubic root of 21349473 is about 277.4144334837.

The spelling of 21349473 in words is "twenty-one million, three hundred forty-nine thousand, four hundred seventy-three".