21347474 has 8 divisors (see below), whose sum is σ = 32233728. Its totient is φ = 10602900.

The previous prime is 21347467. The next prime is 21347533. The reversal of 21347474 is 47474312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21347474.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35042 + ... + 35645.

It is an arithmetic number, because the mean of its divisors is an integer number (4029216).

Almost surely, 2^21347474 is an apocalyptic number.

21347474 is a deficient number, since it is larger than the sum of its proper divisors (10886254).

21347474 is a wasteful number, since it uses less digits than its factorization.

21347474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70840.

The product of its digits is 18816, while the sum is 32.

The square root of 21347474 is about 4620.3326720053. The cubic root of 21347474 is about 277.4057748975.

The spelling of 21347474 in words is "twenty-one million, three hundred forty-seven thousand, four hundred seventy-four".