40221561 has 8 divisors (see below), whose sum is σ = 53691264. Its totient is φ = 26783120.

The previous prime is 40221557. The next prime is 40221563. The reversal of 40221561 is 16512204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40221561 - 2² = 40221557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40221563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4626 + ... + 10091.

It is an arithmetic number, because the mean of its divisors is an integer number (6711408).

Almost surely, 2^40221561 is an apocalyptic number.

It is an amenable number.

40221561 is a deficient number, since it is larger than the sum of its proper divisors (13469703).

40221561 is a wasteful number, since it uses less digits than its factorization.

40221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15631.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 40221561 is about 6342.0470669966. The cubic root of 40221561 is about 342.6254670237.

Adding to 40221561 its reverse (16512204), we get a palindrome (56733765).

The spelling of 40221561 in words is "forty million, two hundred twenty-one thousand, five hundred sixty-one".