31421203 has 4 divisors (see below), whose sum is σ = 34277688. Its totient is φ = 28564720.

The previous prime is 31421189. The next prime is 31421213. The reversal of 31421203 is 30212413.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31421203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428226 + ... + 1428247.

It is an arithmetic number, because the mean of its divisors is an integer number (8569422).

Almost surely, 2^31421203 is an apocalyptic number.

31421203 is a deficient number, since it is larger than the sum of its proper divisors (2856485).

31421203 is a wasteful number, since it uses less digits than its factorization.

31421203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856484.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31421203 is about 5605.4618899784. The cubic root of 31421203 is about 315.5544212739.

Adding to 31421203 its reverse (30212413), we get a palindrome (61633616).

The spelling of 31421203 in words is "thirty-one million, four hundred twenty-one thousand, two hundred three".