21983494 has 16 divisors (see below), whose sum is σ = 37381680. Its totient is φ = 9612000.

The previous prime is 21983483. The next prime is 21983519. The reversal of 21983494 is 49438912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21757 + ... + 22744.

It is an arithmetic number, because the mean of its divisors is an integer number (2336355).

Almost surely, 2^21983494 is an apocalyptic number.

21983494 is a deficient number, since it is larger than the sum of its proper divisors (15398186).

21983494 is a wasteful number, since it uses less digits than its factorization.

21983494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44535.

The product of its digits is 62208, while the sum is 40.

The square root of 21983494 is about 4688.6558841527. The cubic root of 21983494 is about 280.1338390764.

The spelling of 21983494 in words is "twenty-one million, nine hundred eighty-three thousand, four hundred ninety-four".