31220423033 has 4 divisors (see below), whose sum is σ = 31263845760. Its totient is φ = 31177000308.

The previous prime is 31220423011. The next prime is 31220423057. The reversal of 31220423033 is 33032402213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33032402213 = 97 ⋅340540229.

It is a cyclic number.

It is not a de Polignac number, because 31220423033 - 2²⁰ = 31219374457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220623033) 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 3 ways as a sum of consecutive naturals, for example, 21710285 + ... + 21711722.

It is an arithmetic number, because the mean of its divisors is an integer number (7815961440).

Almost surely, 2^31220423033 is an apocalyptic number.

It is an amenable number.

31220423033 is a deficient number, since it is larger than the sum of its proper divisors (43422727).

31220423033 is an equidigital number, since it uses as much as digits as its factorization.

31220423033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43422726.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 31220423033 its reverse (33032402213), we get a palindrome (64252825246).

The spelling of 31220423033 in words is "thirty-one billion, two hundred twenty million, four hundred twenty-three thousand, thirty-three".