31232221099 has 4 divisors (see below), whose sum is σ = 31232895136. Its totient is φ = 31231547064.

The previous prime is 31232221087. The next prime is 31232221103. The reversal of 31232221099 is 99012223213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99012223213 = 31223 ⋅3171131.

It is a cyclic number.

It is not a de Polignac number, because 31232221099 - 2²⁷ = 31098003371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31232221039) 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, 261939 + ... + 362044.

It is an arithmetic number, because the mean of its divisors is an integer number (7808223784).

Almost surely, 2^31232221099 is an apocalyptic number.

31232221099 is a deficient number, since it is larger than the sum of its proper divisors (674037).

31232221099 is an equidigital number, since it uses as much as digits as its factorization.

31232221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674036.

The product of its (nonzero) digits is 11664, while the sum is 34.

It can be divided in two parts, 3123 and 2221099, that added together give a palindrome (2224222).

The spelling of 31232221099 in words is "thirty-one billion, two hundred thirty-two million, two hundred twenty-one thousand, ninety-nine".