40201921 has 2 divisors, whose sum is σ = 40201922. Its totient is φ = 40201920.

The previous prime is 40201919. The next prime is 40201937. The reversal of 40201921 is 12910204.

40201921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40132225 + 69696 = 6335^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 40201921 - 2¹ = 40201919 is a prime.

Together with 40201919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40201981) 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 as a sum of consecutive naturals, namely, 20100960 + 20100961.

It is an arithmetic number, because the mean of its divisors is an integer number (20100961).

Almost surely, 2^40201921 is an apocalyptic number.

It is an amenable number.

40201921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40201921 is an equidigital number, since it uses as much as digits as its factorization.

40201921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 40201921 is about 6340.4984819807. The cubic root of 40201921 is about 342.5696904735.

The spelling of 40201921 in words is "forty million, two hundred one thousand, nine hundred twenty-one".