21121033 has 2 divisors, whose sum is σ = 21121034. Its totient is φ = 21121032.

The previous prime is 21121003. The next prime is 21121063. The reversal of 21121033 is 33012112.

It is a balanced prime because it is at equal distance from previous prime (21121003) and next prime (21121063).

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 71289 = 4588^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121033 - 2²¹ = 19023881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560516 + 10560517.

It is an arithmetic number, because the mean of its divisors is an integer number (10560517).

Almost surely, 2^21121033 is an apocalyptic number.

It is an amenable number.

21121033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121033 is an equidigital number, since it uses as much as digits as its factorization.

21121033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21121033 is about 4595.7625047428. The cubic root of 21121033 is about 276.4214357351.

Adding to 21121033 its reverse (33012112), we get a palindrome (54133145).

The spelling of 21121033 in words is "twenty-one million, one hundred twenty-one thousand, thirty-three".