33377221 has 2 divisors, whose sum is σ = 33377222. Its totient is φ = 33377220.

The previous prime is 33377213. The next prime is 33377233. The reversal of 33377221 is 12277333.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33062500 + 314721 = 5750^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 33377221 - 2³ = 33377213 is a prime.

It is a super-2 number, since 2×33377221² = 2228077763365682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33377221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33377261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16688610 + 16688611.

It is an arithmetic number, because the mean of its divisors is an integer number (16688611).

Almost surely, 2^33377221 is an apocalyptic number.

It is an amenable number.

33377221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33377221 is an equidigital number, since it uses as much as digits as its factorization.

33377221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 28.

The square root of 33377221 is about 5777.3022250874. The cubic root of 33377221 is about 321.9709765129.

The spelling of 33377221 in words is "thirty-three million, three hundred seventy-seven thousand, two hundred twenty-one".