33663121 has 4 divisors (see below), whose sum is σ = 33803044. Its totient is φ = 33523200.

The previous prime is 33663107. The next prime is 33663137. The reversal of 33663121 is 12136633.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13771521 + 19891600 = 3711^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 33663121 - 2⁵ = 33663089 is a prime.

It is a super-2 number, since 2×33663121² = 2266411430921282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33663221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69600 + ... + 70081.

It is an arithmetic number, because the mean of its divisors is an integer number (8450761).

Almost surely, 2^33663121 is an apocalyptic number.

It is an amenable number.

33663121 is a deficient number, since it is larger than the sum of its proper divisors (139923).

33663121 is a wasteful number, since it uses less digits than its factorization.

33663121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139922.

The product of its digits is 1944, while the sum is 25.

The square root of 33663121 is about 5801.9928472896. The cubic root of 33663121 is about 322.8876687347.

Adding to 33663121 its reverse (12136633), we get a palindrome (45799754).

The spelling of 33663121 in words is "thirty-three million, six hundred sixty-three thousand, one hundred twenty-one".