21488099 has 2 divisors, whose sum is σ = 21488100. Its totient is φ = 21488098.

The previous prime is 21488087. The next prime is 21488113. The reversal of 21488099 is 99088412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21488099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21488399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744049 + 10744050.

It is an arithmetic number, because the mean of its divisors is an integer number (10744050).

Almost surely, 2^21488099 is an apocalyptic number.

21488099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21488099 is an equidigital number, since it uses as much as digits as its factorization.

21488099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 21488099 is about 4635.5257522745. The cubic root of 21488099 is about 278.0135726513.

The spelling of 21488099 in words is "twenty-one million, four hundred eighty-eight thousand, ninety-nine".