21488699 has 4 divisors (see below), whose sum is σ = 21512760. Its totient is φ = 21464640.

The previous prime is 21488689. The next prime is 21488713. The reversal of 21488699 is 99688412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21488699 - 2⁴ = 21488683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21488609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10637 + ... + 12494.

It is an arithmetic number, because the mean of its divisors is an integer number (5378190).

Almost surely, 2^21488699 is an apocalyptic number.

21488699 is a deficient number, since it is larger than the sum of its proper divisors (24061).

21488699 is an equidigital number, since it uses as much as digits as its factorization.

21488699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24060.

The product of its digits is 248832, while the sum is 47.

The square root of 21488699 is about 4635.5904694009. The cubic root of 21488699 is about 278.0161602324.

The spelling of 21488699 in words is "twenty-one million, four hundred eighty-eight thousand, six hundred ninety-nine".