32981021 has 4 divisors (see below), whose sum is σ = 32993472. Its totient is φ = 32968572.

The previous prime is 32981009. The next prime is 32981029. The reversal of 32981021 is 12018923.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32981021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32981029) 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 3 ways as a sum of consecutive naturals, for example, 491 + ... + 8136.

It is an arithmetic number, because the mean of its divisors is an integer number (8248368).

Almost surely, 2^32981021 is an apocalyptic number.

It is an amenable number.

32981021 is a deficient number, since it is larger than the sum of its proper divisors (12451).

32981021 is an equidigital number, since it uses as much as digits as its factorization.

32981021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12450.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 32981021 is about 5742.9104990414. The cubic root of 32981021 is about 320.6919305066.

Adding to 32981021 its reverse (12018923), we get a palindrome (44999944).

The spelling of 32981021 in words is "thirty-two million, nine hundred eighty-one thousand, twenty-one".