21031203 has 8 divisors (see below), whose sum is σ = 28064448. Its totient is φ = 14009384.

The previous prime is 21031187. The next prime is 21031217. The reversal of 21031203 is 30213012.

It is a happy number.

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 21031203 - 2⁴ = 21031187 is a prime.

It is a super-2 number, since 2×21031203² = 884622999254418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031253) 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, 3400 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (3508056).

Almost surely, 2^21031203 is an apocalyptic number.

21031203 is a deficient number, since it is larger than the sum of its proper divisors (7033245).

21031203 is a wasteful number, since it uses less digits than its factorization.

21031203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21031203 is about 4585.9789576491. The cubic root of 21031203 is about 276.0289955885.

Adding to 21031203 its reverse (30213012), we get a palindrome (51244215).

It can be divided in two parts, 210 and 31203, that added together give a palindrome (31413).

The spelling of 21031203 in words is "twenty-one million, thirty-one thousand, two hundred three".