21246193 has 2 divisors, whose sum is σ = 21246194. Its totient is φ = 21246192.

The previous prime is 21246187. The next prime is 21246221. The reversal of 21246193 is 39164212.

It is an a-pointer prime, because the next prime (21246221) can be obtained adding 21246193 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21095649 + 150544 = 4593^2 + 388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21246193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21246133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10623096 + 10623097.

It is an arithmetic number, because the mean of its divisors is an integer number (10623097).

Almost surely, 2^21246193 is an apocalyptic number.

It is an amenable number.

21246193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21246193 is an equidigital number, since it uses as much as digits as its factorization.

21246193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 21246193 is about 4609.3592830241. The cubic root of 21246193 is about 276.9663710820.

The spelling of 21246193 in words is "twenty-one million, two hundred forty-six thousand, one hundred ninety-three".