31200213122 has 16 divisors (see below), whose sum is σ = 52138288440. Its totient is φ = 13903542912.

The previous prime is 31200213119. The next prime is 31200213127. The reversal of 31200213122 is 22131200213.

It can be written as a sum of positive squares in 4 ways, for example, as 28456653481 + 2743559641 = 168691^2 + 52379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31200213122.

It is not an unprimeable number, because it can be changed into a prime (31200213127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20689043 + ... + 20690550.

Almost surely, 2^31200213122 is an apocalyptic number.

31200213122 is a deficient number, since it is larger than the sum of its proper divisors (20938075318).

31200213122 is a wasteful number, since it uses less digits than its factorization.

31200213122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41379637.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31200213122 its reverse (22131200213), we get a palindrome (53331413335).

The spelling of 31200213122 in words is "thirty-one billion, two hundred million, two hundred thirteen thousand, one hundred twenty-two".