40061221 has 2 divisors, whose sum is σ = 40061222. Its totient is φ = 40061220.

The previous prime is 40061191. The next prime is 40061233. The reversal of 40061221 is 12216004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 6305121 = 5810^2 + 2511^2 .

It is a cyclic number.

It is not a de Polignac number, because 40061221 - 2¹³ = 40053029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40061195 and 40061204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40061521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20030610 + 20030611.

It is an arithmetic number, because the mean of its divisors is an integer number (20030611).

Almost surely, 2^40061221 is an apocalyptic number.

It is an amenable number.

40061221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40061221 is an equidigital number, since it uses as much as digits as its factorization.

40061221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40061221 is about 6329.3934148542. The cubic root of 40061221 is about 342.1695777927.

Adding to 40061221 its reverse (12216004), we get a palindrome (52277225).

The spelling of 40061221 in words is "forty million, sixty-one thousand, two hundred twenty-one".