31033100221 has 4 divisors (see below), whose sum is σ = 32382365472. Its totient is φ = 29683834972.

The previous prime is 31033100213. The next prime is 31033100233. The reversal of 31033100221 is 12200133013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12200133013 = 9371 ⋅1301903.

It is a cyclic number.

It is not a de Polignac number, because 31033100221 - 2³ = 31033100213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31033100195 and 31033100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033100201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674632591 + ... + 674632636.

It is an arithmetic number, because the mean of its divisors is an integer number (8095591368).

Almost surely, 2^31033100221 is an apocalyptic number.

It is an amenable number.

31033100221 is a deficient number, since it is larger than the sum of its proper divisors (1349265251).

31033100221 is a wasteful number, since it uses less digits than its factorization.

31033100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349265250.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31033100221 its reverse (12200133013), we get a palindrome (43233233234).

The spelling of 31033100221 in words is "thirty-one billion, thirty-three million, one hundred thousand, two hundred twenty-one".