32105921 has 2 divisors, whose sum is σ = 32105922. Its totient is φ = 32105920.

The previous prime is 32105903. The next prime is 32105923. The reversal of 32105921 is 12950123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 15295921 = 4100^2 + 3911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32105921 is a prime.

It is a Sophie Germain prime.

Together with 32105923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (32105923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16052960 + 16052961.

It is an arithmetic number, because the mean of its divisors is an integer number (16052961).

Almost surely, 2^32105921 is an apocalyptic number.

It is an amenable number.

32105921 is a deficient number, since it is larger than the sum of its proper divisors (1).

32105921 is an equidigital number, since it uses as much as digits as its factorization.

32105921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 32105921 is about 5666.2086971802. The cubic root of 32105921 is about 317.8301144186.

The spelling of 32105921 in words is "thirty-two million, one hundred five thousand, nine hundred twenty-one".