31121230103 has 4 divisors (see below), whose sum is σ = 32474327088. Its totient is φ = 29768133120.

The previous prime is 31121230097. The next prime is 31121230111. The reversal of 31121230103 is 30103212113.

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 31121230103 - 2¹⁰ = 31121229079 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 (31121230163) 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, 676548458 + ... + 676548503.

It is an arithmetic number, because the mean of its divisors is an integer number (8118581772).

Almost surely, 2^31121230103 is an apocalyptic number.

31121230103 is a deficient number, since it is larger than the sum of its proper divisors (1353096985).

31121230103 is a wasteful number, since it uses less digits than its factorization.

31121230103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353096984.

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

Adding to 31121230103 its reverse (30103212113), we get a palindrome (61224442216).

The spelling of 31121230103 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, one hundred three".