31201221121000 has 64 divisors (see below), whose sum is σ = 83440979930880. Its totient is φ = 10697561524800.

The previous prime is 31201221120991. The next prime is 31201221121013. The reversal of 31201221121000 is 12112210213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2228651652 + ... + 2228665651.

It is an arithmetic number, because the mean of its divisors is an integer number (1303765311420).

Almost surely, 2^{31201221121000} is an apocalyptic number.

It is an amenable number.

31201221121000 is an abundant number, since it is smaller than the sum of its proper divisors (52239758809880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31201221121000 is a wasteful number, since it uses less digits than its factorization.

31201221121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457317331 (or 4457317317 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31201221121000 its reverse (12112210213), we get a palindrome (31213333331213).

The spelling of 31201221121000 in words is "thirty-one trillion, two hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand".