21983505 has 8 divisors (see below), whose sum is σ = 35173632. Its totient is φ = 11724528.

The previous prime is 21983483. The next prime is 21983519. The reversal of 21983505 is 50538912.

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

It is not a de Polignac number, because 21983505 - 2⁶ = 21983441 is a prime.

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, 732769 + ... + 732798.

It is an arithmetic number, because the mean of its divisors is an integer number (4396704).

Almost surely, 2^21983505 is an apocalyptic number.

It is an amenable number.

21983505 is a deficient number, since it is larger than the sum of its proper divisors (13190127).

21983505 is a wasteful number, since it uses less digits than its factorization.

21983505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465575.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 21983505 is about 4688.6570571967. The cubic root of 21983505 is about 280.1338858004.

The spelling of 21983505 in words is "twenty-one million, nine hundred eighty-three thousand, five hundred five".