31020221203 has 4 divisors (see below), whose sum is σ = 31327352208. Its totient is φ = 30713090200.

The previous prime is 31020221191. The next prime is 31020221261. The reversal of 31020221203 is 30212202013.

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-31020221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020221263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153565351 + ... + 153565552.

It is an arithmetic number, because the mean of its divisors is an integer number (7831838052).

Almost surely, 2^31020221203 is an apocalyptic number.

31020221203 is a deficient number, since it is larger than the sum of its proper divisors (307131005).

31020221203 is a wasteful number, since it uses less digits than its factorization.

31020221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307131004.

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

Adding to 31020221203 its reverse (30212202013), we get a palindrome (61232423216).

The spelling of 31020221203 in words is "thirty-one billion, twenty million, two hundred twenty-one thousand, two hundred three".