40999921 has 2 divisors, whose sum is σ = 40999922. Its totient is φ = 40999920.

The previous prime is 40999843. The next prime is 40999951. The reversal of 40999921 is 12999904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 5239521 = 5980^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 40999921 - 2¹⁵ = 40967153 is a prime.

It is not a weakly prime, because it can be changed into another prime (40999951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20499960 + 20499961.

It is an arithmetic number, because the mean of its divisors is an integer number (20499961).

Almost surely, 2^40999921 is an apocalyptic number.

It is an amenable number.

40999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40999921 is an equidigital number, since it uses as much as digits as its factorization.

40999921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 40999921 is about 6403.1180685663. The cubic root of 40999921 is about 344.8215025673.

The spelling of 40999921 in words is "forty million, nine hundred ninety-nine thousand, nine hundred twenty-one".