40221251 has 4 divisors (see below), whose sum is σ = 45967152. Its totient is φ = 34475352.

The previous prime is 40221221. The next prime is 40221253. The reversal of 40221251 is 15212204.

40221251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40221251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40221253) 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 in 3 ways as a sum of consecutive naturals, for example, 2872940 + ... + 2872953.

It is an arithmetic number, because the mean of its divisors is an integer number (11491788).

Almost surely, 2^40221251 is an apocalyptic number.

40221251 is a deficient number, since it is larger than the sum of its proper divisors (5745901).

40221251 is an equidigital number, since it uses as much as digits as its factorization.

40221251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745900.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 40221251 is about 6342.0226268912. The cubic root of 40221251 is about 342.6245867813.

Adding to 40221251 its reverse (15212204), we get a palindrome (55433455).

The spelling of 40221251 in words is "forty million, two hundred twenty-one thousand, two hundred fifty-one".