33020121931 has 2 divisors, whose sum is σ = 33020121932. Its totient is φ = 33020121930.

The previous prime is 33020121929. The next prime is 33020121941. The reversal of 33020121931 is 13912102033.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 33020121931 - 2¹ = 33020121929 is a prime.

It is a super-2 number, since 2×33020121931² (a number of 22 digits) contains 22 as substring.

Together with 33020121929, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 33020121896 and 33020121905.

It is not a weakly prime, because it can be changed into another prime (33020121941) 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 as a sum of consecutive naturals, namely, 16510060965 + 16510060966.

It is an arithmetic number, because the mean of its divisors is an integer number (16510060966).

Almost surely, 2^33020121931 is an apocalyptic number.

33020121931 is a deficient number, since it is larger than the sum of its proper divisors (1).

33020121931 is an equidigital number, since it uses as much as digits as its factorization.

33020121931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 33020121931 its reverse (13912102033), we get a palindrome (46932223964).

The spelling of 33020121931 in words is "thirty-three billion, twenty million, one hundred twenty-one thousand, nine hundred thirty-one".