31201213103 has 4 divisors (see below), whose sum is σ = 31251619560. Its totient is φ = 31150806648.

The previous prime is 31201213091. The next prime is 31201213111. The reversal of 31201213103 is 30131210213.

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

It is a cyclic number.

It is not a de Polignac number, because 31201213103 - 2¹⁶ = 31201147567 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 (31201233103) 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, 25202300 + ... + 25203537.

It is an arithmetic number, because the mean of its divisors is an integer number (7812904890).

Almost surely, 2^31201213103 is an apocalyptic number.

31201213103 is a deficient number, since it is larger than the sum of its proper divisors (50406457).

31201213103 is an equidigital number, since it uses as much as digits as its factorization.

31201213103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50406456.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31201213103 its reverse (30131210213), we get a palindrome (61332423316).

The spelling of 31201213103 in words is "thirty-one billion, two hundred one million, two hundred thirteen thousand, one hundred three".