21299147 has 8 divisors (see below), whose sum is σ = 23077296. Its totient is φ = 19579392.

The previous prime is 21299143. The next prime is 21299149. The reversal of 21299147 is 74199212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21299147 - 2² = 21299143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21299141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13838 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (2884662).

Almost surely, 2^21299147 is an apocalyptic number.

21299147 is a deficient number, since it is larger than the sum of its proper divisors (1778149).

21299147 is a wasteful number, since it uses less digits than its factorization.

21299147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29197.

The product of its digits is 9072, while the sum is 35.

The square root of 21299147 is about 4615.0998905766. The cubic root of 21299147 is about 277.1962837877.

The spelling of 21299147 in words is "twenty-one million, two hundred ninety-nine thousand, one hundred forty-seven".