33350021 has 2 divisors, whose sum is σ = 33350022. Its totient is φ = 33350020.

The previous prime is 33349999. The next prime is 33350033. The reversal of 33350021 is 12005333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 57121 = 5770^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 33350021 - 2¹⁴ = 33333637 is a prime.

It is a super-2 number, since 2×33350021² = 2224447801400882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33356021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16675010 + 16675011.

It is an arithmetic number, because the mean of its divisors is an integer number (16675011).

Almost surely, 2^33350021 is an apocalyptic number.

It is an amenable number.

33350021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33350021 is an equidigital number, since it uses as much as digits as its factorization.

33350021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 33350021 is about 5774.9477053909. The cubic root of 33350021 is about 321.8834917922.

Adding to 33350021 its reverse (12005333), we get a palindrome (45355354).

The spelling of 33350021 in words is "thirty-three million, three hundred fifty thousand, twenty-one".