21949183 has 2 divisors, whose sum is σ = 21949184. Its totient is φ = 21949182.

The previous prime is 21949163. The next prime is 21949211. The reversal of 21949183 is 38194912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21949183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21949163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974591 + 10974592.

It is an arithmetic number, because the mean of its divisors is an integer number (10974592).

Almost surely, 2^21949183 is an apocalyptic number.

21949183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21949183 is an equidigital number, since it uses as much as digits as its factorization.

21949183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 21949183 is about 4684.9955176072. The cubic root of 21949183 is about 279.9880224468.

The spelling of 21949183 in words is "twenty-one million, nine hundred forty-nine thousand, one hundred eighty-three".