21493422233 has 2 divisors, whose sum is σ = 21493422234. Its totient is φ = 21493422232.

The previous prime is 21493422229. The next prime is 21493422241. The reversal of 21493422233 is 33222439412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19733787529 + 1759634704 = 140477^2 + 41948^2 .

It is a cyclic number.

It is not a de Polignac number, because 21493422233 - 2² = 21493422229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21493422193 and 21493422202.

It is not a weakly prime, because it can be changed into another prime (21493424233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746711116 + 10746711117.

It is an arithmetic number, because the mean of its divisors is an integer number (10746711117).

Almost surely, 2^21493422233 is an apocalyptic number.

It is an amenable number.

21493422233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21493422233 is an equidigital number, since it uses as much as digits as its factorization.

21493422233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

The spelling of 21493422233 in words is "twenty-one billion, four hundred ninety-three million, four hundred twenty-two thousand, two hundred thirty-three".