31220212434401 has 16 divisors (see below), whose sum is σ = 32472332394768. Its totient is φ = 29992809369600.

The previous prime is 31220212434391. The next prime is 31220212434431. The reversal of 31220212434401 is 10443421202213.

It can be written as a sum of positive squares in 8 ways, for example, as 19511832528400 + 11708379906001 = 4417220^2 + 3421751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220212434401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31220212434431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6606380 + ... + 10299741.

It is an arithmetic number, because the mean of its divisors is an integer number (2029520774673).

Almost surely, 2^{31220212434401} is an apocalyptic number.

It is an amenable number.

31220212434401 is a deficient number, since it is larger than the sum of its proper divisors (1252119960367).

31220212434401 is a wasteful number, since it uses less digits than its factorization.

31220212434401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16906852.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 31220212434401 its reverse (10443421202213), we get a palindrome (41663633636614).

The spelling of 31220212434401 in words is "thirty-one trillion, two hundred twenty billion, two hundred twelve million, four hundred thirty-four thousand, four hundred one".