31201221099 has 16 divisors (see below), whose sum is σ = 45073176192. Its totient is φ = 19121950848.

The previous prime is 31201221083. The next prime is 31201221119. The reversal of 31201221099 is 99012210213.

It is not a de Polignac number, because 31201221099 - 2⁴ = 31201221083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31201221059) 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, 7111629 + ... + 7116014.

It is an arithmetic number, because the mean of its divisors is an integer number (2817073512).

Almost surely, 2^31201221099 is an apocalyptic number.

31201221099 is a deficient number, since it is larger than the sum of its proper divisors (13871955093).

31201221099 is a wasteful number, since it uses less digits than its factorization.

31201221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14227706.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 31201221099 in words is "thirty-one billion, two hundred one million, two hundred twenty-one thousand, ninety-nine".