21112021033 has 2 divisors, whose sum is σ = 21112021034. Its totient is φ = 21112021032.

The previous prime is 21112020971. The next prime is 21112021061. The reversal of 21112021033 is 33012021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16828056729 + 4283964304 = 129723^2 + 65452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112021033 - 2¹³ = 21112012841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112020998 and 21112021016.

It is not a weakly prime, because it can be changed into another prime (21112021433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556010516 + 10556010517.

It is an arithmetic number, because the mean of its divisors is an integer number (10556010517).

Almost surely, 2^21112021033 is an apocalyptic number.

It is an amenable number.

21112021033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112021033 is an equidigital number, since it uses as much as digits as its factorization.

21112021033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21112021033 its reverse (33012021112), we get a palindrome (54124042145).

The spelling of 21112021033 in words is "twenty-one billion, one hundred twelve million, twenty-one thousand, thirty-three".