33401221 has 32 divisors (see below), whose sum is σ = 42854400. Its totient is φ = 25375680.

The previous prime is 33401219. The next prime is 33401233. The reversal of 33401221 is 12210433.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 33401221 - 2¹ = 33401219 is a prime.

It is a super-2 number, since 2×33401221² = 2231283128581682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33401195 and 33401204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33401261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186510 + ... + 186688.

It is an arithmetic number, because the mean of its divisors is an integer number (1339200).

Almost surely, 2^33401221 is an apocalyptic number.

It is an amenable number.

33401221 is a deficient number, since it is larger than the sum of its proper divisors (9453179).

33401221 is a wasteful number, since it uses less digits than its factorization.

33401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 33401221 is about 5779.3789458730. The cubic root of 33401221 is about 322.0481294517.

Adding to 33401221 its reverse (12210433), we get a palindrome (45611654).

The spelling of 33401221 in words is "thirty-three million, four hundred one thousand, two hundred twenty-one".