40421533 has 2 divisors, whose sum is σ = 40421534. Its totient is φ = 40421532.

The previous prime is 40421519. The next prime is 40421543. The reversal of 40421533 is 33512404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38713284 + 1708249 = 6222^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 40421533 - 2⁹ = 40421021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40421503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20210766 + 20210767.

It is an arithmetic number, because the mean of its divisors is an integer number (20210767).

Almost surely, 2^40421533 is an apocalyptic number.

It is an amenable number.

40421533 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421533 is an equidigital number, since it uses as much as digits as its factorization.

40421533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 40421533 is about 6357.7930919463. The cubic root of 40421533 is about 343.1923459415.

Adding to 40421533 its reverse (33512404), we get a palindrome (73933937).

The spelling of 40421533 in words is "forty million, four hundred twenty-one thousand, five hundred thirty-three".