21975383 has 2 divisors, whose sum is σ = 21975384. Its totient is φ = 21975382.

The previous prime is 21975379. The next prime is 21975413. The reversal of 21975383 is 38357912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21975383 - 2² = 21975379 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21975313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10987691 + 10987692.

It is an arithmetic number, because the mean of its divisors is an integer number (10987692).

Almost surely, 2^21975383 is an apocalyptic number.

21975383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21975383 is an equidigital number, since it uses as much as digits as its factorization.

21975383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 21975383 is about 4687.7908443104. The cubic root of 21975383 is about 280.0993822384.

The spelling of 21975383 in words is "twenty-one million, nine hundred seventy-five thousand, three hundred eighty-three".