21142799 has 16 divisors (see below), whose sum is σ = 22612128. Its totient is φ = 19740672.

The previous prime is 21142789. The next prime is 21142811. The reversal of 21142799 is 99724112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154259 + ... + 154395.

It is an arithmetic number, because the mean of its divisors is an integer number (1413258).

Almost surely, 2^21142799 is an apocalyptic number.

21142799 is a deficient number, since it is larger than the sum of its proper divisors (1469329).

21142799 is a wasteful number, since it uses less digits than its factorization.

21142799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314.

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

The square root of 21142799 is about 4598.1299459672. The cubic root of 21142799 is about 276.5163572821.

It can be divided in two parts, 2114 and 2799, that added together give a cube (4913 = 17³).

The spelling of 21142799 in words is "twenty-one million, one hundred forty-two thousand, seven hundred ninety-nine".