21433233197 has 2 divisors, whose sum is σ = 21433233198. Its totient is φ = 21433233196.

The previous prime is 21433233187. The next prime is 21433233257. The reversal of 21433233197 is 79133233412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19974451561 + 1458781636 = 141331^2 + 38194^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433233197 - 2¹⁴ = 21433216813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21433233197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433233187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716616598 + 10716616599.

It is an arithmetic number, because the mean of its divisors is an integer number (10716616599).

Almost surely, 2^21433233197 is an apocalyptic number.

It is an amenable number.

21433233197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433233197 is an equidigital number, since it uses as much as digits as its factorization.

21433233197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 38.

The spelling of 21433233197 in words is "twenty-one billion, four hundred thirty-three million, two hundred thirty-three thousand, one hundred ninety-seven".