33131021 has 32 divisors (see below), whose sum is σ = 43994880. Its totient is φ = 24192000.

The previous prime is 33130997. The next prime is 33131023. The reversal of 33131021 is 12013133.

It is not a de Polignac number, because 33131021 - 2¹⁰ = 33129997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33130987 and 33131005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82421 + ... + 82821.

It is an arithmetic number, because the mean of its divisors is an integer number (1374840).

Almost surely, 2^33131021 is an apocalyptic number.

It is an amenable number.

33131021 is a deficient number, since it is larger than the sum of its proper divisors (10863859).

33131021 is a wasteful number, since it uses less digits than its factorization.

33131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 33131021 is about 5755.9552638984. The cubic root of 33131021 is about 321.1773717831.

Adding to 33131021 its reverse (12013133), we get a palindrome (45144154).

It can be divided in two parts, 3313 and 1021, that added together give a palindrome (4334).

The spelling of 33131021 in words is "thirty-three million, one hundred thirty-one thousand, twenty-one".