21850393 has 2 divisors, whose sum is σ = 21850394. Its totient is φ = 21850392.

The previous prime is 21850357. The next prime is 21850429. The reversal of 21850393 is 39305812.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21850357) and next prime (21850429).

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 1708249 = 4488^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 21850393 - 2⁹ = 21849881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21850333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10925196 + 10925197.

It is an arithmetic number, because the mean of its divisors is an integer number (10925197).

Almost surely, 2^21850393 is an apocalyptic number.

It is an amenable number.

21850393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850393 is an equidigital number, since it uses as much as digits as its factorization.

21850393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21850393 is about 4674.4403943146. The cubic root of 21850393 is about 279.5673292076.

The spelling of 21850393 in words is "twenty-one million, eight hundred fifty thousand, three hundred ninety-three".