31003111021 has 8 divisors (see below), whose sum is σ = 32920889400. Its totient is φ = 29095784448.

The previous prime is 31003110989. The next prime is 31003111031. The reversal of 31003111021 is 12011130013.

It can be written as a sum of positive squares in 4 ways, for example, as 5214284100 + 25788826921 = 72210^2 + 160589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31003111021 - 2⁵ = 31003110989 is a prime.

It is a super-2 number, since 2×31003111021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31003110992 and 31003111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003111031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2606836 + ... + 2618701.

It is an arithmetic number, because the mean of its divisors is an integer number (4115111175).

Almost surely, 2^31003111021 is an apocalyptic number.

It is an amenable number.

31003111021 is a deficient number, since it is larger than the sum of its proper divisors (1917778379).

31003111021 is a wasteful number, since it uses less digits than its factorization.

31003111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225903.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31003111021 its reverse (12011130013), we get a palindrome (43014241034).

The spelling of 31003111021 in words is "thirty-one billion, three million, one hundred eleven thousand, twenty-one".