21042699 has 8 divisors (see below), whose sum is σ = 28654080. Its totient is φ = 13729896.

The previous prime is 21042689. The next prime is 21042731. The reversal of 21042699 is 99624012.

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

It is not a de Polignac number, because 21042699 - 2⁹ = 21042187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21042629) 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, 74479 + ... + 74760.

It is an arithmetic number, because the mean of its divisors is an integer number (3581760).

Almost surely, 2^21042699 is an apocalyptic number.

21042699 is a deficient number, since it is larger than the sum of its proper divisors (7611381).

21042699 is a wasteful number, since it uses less digits than its factorization.

21042699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149289.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21042699 is about 4587.2321720183. The cubic root of 21042699 is about 276.0792804173.

The spelling of 21042699 in words is "twenty-one million, forty-two thousand, six hundred ninety-nine".