21834997 has 2 divisors, whose sum is σ = 21834998. Its totient is φ = 21834996.

The previous prime is 21834961. The next prime is 21835007. The reversal of 21834997 is 79943812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 6105841 = 3966^2 + 2471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21834997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21834947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917498 + 10917499.

It is an arithmetic number, because the mean of its divisors is an integer number (10917499).

Almost surely, 2^21834997 is an apocalyptic number.

It is an amenable number.

21834997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834997 is an equidigital number, since it uses as much as digits as its factorization.

21834997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 21834997 is about 4672.7932759753. The cubic root of 21834997 is about 279.5016518240.

The spelling of 21834997 in words is "twenty-one million, eight hundred thirty-four thousand, nine hundred ninety-seven".