21983071 has 8 divisors (see below), whose sum is σ = 24039504. Its totient is φ = 19936320.

The previous prime is 21983047. The next prime is 21983077. The reversal of 21983071 is 17038912.

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

It is a cyclic number.

It is not a de Polignac number, because 21983071 - 2²¹ = 19885919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983077) 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, 2841 + ... + 7213.

It is an arithmetic number, because the mean of its divisors is an integer number (3004938).

Almost surely, 2^21983071 is an apocalyptic number.

21983071 is a deficient number, since it is larger than the sum of its proper divisors (2056433).

21983071 is a wasteful number, since it uses less digits than its factorization.

21983071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 21983071 is about 4688.6107750591. The cubic root of 21983071 is about 280.1320423136.

The spelling of 21983071 in words is "twenty-one million, nine hundred eighty-three thousand, seventy-one".