40221144641 has 2 divisors, whose sum is σ = 40221144642. Its totient is φ = 40221144640.

The previous prime is 40221144617. The next prime is 40221144701. The reversal of 40221144641 is 14644112204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21744451600 + 18476693041 = 147460^2 + 135929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40221144641 is a prime.

It is not a weakly prime, because it can be changed into another prime (40221144941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110572320 + 20110572321.

It is an arithmetic number, because the mean of its divisors is an integer number (20110572321).

Almost surely, 2^40221144641 is an apocalyptic number.

It is an amenable number.

40221144641 is a deficient number, since it is larger than the sum of its proper divisors (1).

40221144641 is an equidigital number, since it uses as much as digits as its factorization.

40221144641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 40221144641 its reverse (14644112204), we get a palindrome (54865256845).

The spelling of 40221144641 in words is "forty billion, two hundred twenty-one million, one hundred forty-four thousand, six hundred forty-one".