31030103021 has 16 divisors (see below), whose sum is σ = 32862482688. Its totient is φ = 29259792000.

The previous prime is 31030103017. The next prime is 31030103047. The reversal of 31030103021 is 12030103013.

It is a cyclic number.

It is not a de Polignac number, because 31030103021 - 2² = 31030103017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31030102987 and 31030103005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030102021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161336 + ... + 296798.

It is an arithmetic number, because the mean of its divisors is an integer number (2053905168).

Almost surely, 2^31030103021 is an apocalyptic number.

It is an amenable number.

31030103021 is a deficient number, since it is larger than the sum of its proper divisors (1832379667).

31030103021 is a wasteful number, since it uses less digits than its factorization.

31030103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135692.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31030103021 its reverse (12030103013), we get a palindrome (43060206034).

The spelling of 31030103021 in words is "thirty-one billion, thirty million, one hundred three thousand, twenty-one".