21233197 has 2 divisors, whose sum is σ = 21233198. Its totient is φ = 21233196.

The previous prime is 21233183. The next prime is 21233213. The reversal of 21233197 is 79133212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19527561 + 1705636 = 4419^2 + 1306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616598 + 10616599.

It is an arithmetic number, because the mean of its divisors is an integer number (10616599).

Almost surely, 2^21233197 is an apocalyptic number.

It is an amenable number.

21233197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233197 is an equidigital number, since it uses as much as digits as its factorization.

21233197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 21233197 is about 4607.9493269783. The cubic root of 21233197 is about 276.9098874080.

The spelling of 21233197 in words is "twenty-one million, two hundred thirty-three thousand, one hundred ninety-seven".