31220023133 has 16 divisors (see below), whose sum is σ = 36561455280. Its totient is φ = 26390209536.

The previous prime is 31220023103. The next prime is 31220023141. The reversal of 31220023133 is 33132002213.

It can be written as a sum of positive squares in 8 ways, for example, as 897721444 + 30322301689 = 29962^2 + 174133^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220023133 - 2¹⁸ = 31219760989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220023103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1900838 + ... + 1917191.

It is an arithmetic number, because the mean of its divisors is an integer number (2285090955).

Almost surely, 2^31220023133 is an apocalyptic number.

It is an amenable number.

31220023133 is a deficient number, since it is larger than the sum of its proper divisors (5341432147).

31220023133 is a wasteful number, since it uses less digits than its factorization.

31220023133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818096.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31220023133 its reverse (33132002213), we get a palindrome (64352025346).

The spelling of 31220023133 in words is "thirty-one billion, two hundred twenty million, twenty-three thousand, one hundred thirty-three".