21203042 has 16 divisors (see below), whose sum is σ = 37194432. Its totient is φ = 8875440.

The previous prime is 21203041. The next prime is 21203071. The reversal of 21203042 is 24030212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21203041) 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, 17009 + ... + 18212.

It is an arithmetic number, because the mean of its divisors is an integer number (2324652).

Almost surely, 2^21203042 is an apocalyptic number.

21203042 is a deficient number, since it is larger than the sum of its proper divisors (15991390).

21203042 is a wasteful number, since it uses less digits than its factorization.

21203042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35273.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21203042 is about 4604.6761015298. The cubic root of 21203042 is about 276.7787378419.

Adding to 21203042 its reverse (24030212), we get a palindrome (45233254).

The spelling of 21203042 in words is "twenty-one million, two hundred three thousand, forty-two".