21299846 has 4 divisors (see below), whose sum is σ = 31949772. Its totient is φ = 10649922.

The previous prime is 21299843. The next prime is 21299851. The reversal of 21299846 is 64899212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5324960 + ... + 5324963.

It is an arithmetic number, because the mean of its divisors is an integer number (7987443).

Almost surely, 2^21299846 is an apocalyptic number.

21299846 is a deficient number, since it is larger than the sum of its proper divisors (10649926).

21299846 is a wasteful number, since it uses less digits than its factorization.

21299846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649925.

The product of its digits is 62208, while the sum is 41.

The square root of 21299846 is about 4615.1756196271. The cubic root of 21299846 is about 277.1993161170.

The spelling of 21299846 in words is "twenty-one million, two hundred ninety-nine thousand, eight hundred forty-six".