21838474 has 8 divisors (see below), whose sum is σ = 37437408. Its totient is φ = 9359340.

The previous prime is 21838469. The next prime is 21838501. The reversal of 21838474 is 47483812.

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

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, 779932 + ... + 779959.

It is an arithmetic number, because the mean of its divisors is an integer number (4679676).

Almost surely, 2^21838474 is an apocalyptic number.

21838474 is a deficient number, since it is larger than the sum of its proper divisors (15598934).

21838474 is a wasteful number, since it uses less digits than its factorization.

21838474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559900.

The product of its digits is 43008, while the sum is 37.

The square root of 21838474 is about 4673.1653084392. The cubic root of 21838474 is about 279.5164869633.

The spelling of 21838474 in words is "twenty-one million, eight hundred thirty-eight thousand, four hundred seventy-four".