31103000221 has 4 divisors (see below), whose sum is σ = 32175517500. Its totient is φ = 30030482944.

The previous prime is 31103000219. The next prime is 31103000237. The reversal of 31103000221 is 12200030113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26159504121 + 4943496100 = 161739^2 + 70310^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103000221 - 2¹ = 31103000219 is a prime.

It is a super-3 number, since 3×31103000221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103000251) 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, 536258596 + ... + 536258653.

It is an arithmetic number, because the mean of its divisors is an integer number (8043879375).

Almost surely, 2^31103000221 is an apocalyptic number.

It is an amenable number.

31103000221 is a deficient number, since it is larger than the sum of its proper divisors (1072517279).

31103000221 is a wasteful number, since it uses less digits than its factorization.

31103000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072517278.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31103000221 its reverse (12200030113), we get a palindrome (43303030334).

The spelling of 31103000221 in words is "thirty-one billion, one hundred three million, two hundred twenty-one", and thus it is an aban number.