32920021 has 2 divisors, whose sum is σ = 32920022. Its totient is φ = 32920020.

The previous prime is 32919979. The next prime is 32920031. The reversal of 32920021 is 12002923.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29268100 + 3651921 = 5410^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 32920021 - 2¹³ = 32911829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32920031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16460010 + 16460011.

It is an arithmetic number, because the mean of its divisors is an integer number (16460011).

Almost surely, 2^32920021 is an apocalyptic number.

It is an amenable number.

32920021 is a deficient number, since it is larger than the sum of its proper divisors (1).

32920021 is an equidigital number, since it uses as much as digits as its factorization.

32920021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 32920021 is about 5737.5971451471. The cubic root of 32920021 is about 320.4940967222.

Adding to 32920021 its reverse (12002923), we get a palindrome (44922944).

The spelling of 32920021 in words is "thirty-two million, nine hundred twenty thousand, twenty-one".