40152421 has 2 divisors, whose sum is σ = 40152422. Its totient is φ = 40152420.

The previous prime is 40152401. The next prime is 40152493. The reversal of 40152421 is 12425104.

40152421 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., 40068900 + 83521 = 6330^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 40152421 - 2⁷ = 40152293 is a prime.

It is a super-2 number, since 2×40152421² = 3224433824322482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40152401) 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, 20076210 + 20076211.

It is an arithmetic number, because the mean of its divisors is an integer number (20076211).

Almost surely, 2^40152421 is an apocalyptic number.

It is an amenable number.

40152421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40152421 is an equidigital number, since it uses as much as digits as its factorization.

40152421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 40152421 is about 6336.5938010890. The cubic root of 40152421 is about 342.4290324840.

Adding to 40152421 its reverse (12425104), we get a palindrome (52577525).

The spelling of 40152421 in words is "forty million, one hundred fifty-two thousand, four hundred twenty-one".