31200222211121 has 8 divisors (see below), whose sum is σ = 31363105250664. Its totient is φ = 31037384689920.

The previous prime is 31200222211111. The next prime is 31200222211133. The reversal of 31200222211121 is 12111222200213.

It can be written as a sum of positive squares in 4 ways, for example, as 9575862171121 + 21624360040000 = 3094489^2 + 4650200^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31200222211121 - 2⁶ = 31200222211057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200222211093 and 31200222211102.

It is not an unprimeable number, because it can be changed into a prime (31200222211111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10004690 + ... + 12747323.

It is an arithmetic number, because the mean of its divisors is an integer number (3920388156333).

Almost surely, 2^{31200222211121} is an apocalyptic number.

It is an amenable number.

31200222211121 is a deficient number, since it is larger than the sum of its proper divisors (162883039543).

31200222211121 is a wasteful number, since it uses less digits than its factorization.

31200222211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22759171.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 31200222211121 its reverse (12111222200213), we get a palindrome (43311444411334).

The spelling of 31200222211121 in words is "thirty-one trillion, two hundred billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-one".