21834899 has 2 divisors, whose sum is σ = 21834900. Its totient is φ = 21834898.

The previous prime is 21834871. The next prime is 21834947. The reversal of 21834899 is 99843812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21834899 - 2¹² = 21830803 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21834859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917449 + 10917450.

It is an arithmetic number, because the mean of its divisors is an integer number (10917450).

Almost surely, 2^21834899 is an apocalyptic number.

21834899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834899 is an equidigital number, since it uses as much as digits as its factorization.

21834899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 21834899 is about 4672.7827897303. The cubic root of 21834899 is about 279.5012336696.

The spelling of 21834899 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred ninety-nine".