400221109 has 2 divisors, whose sum is σ = 400221110. Its totient is φ = 400221108.

The previous prime is 400221053. The next prime is 400221139. The reversal of 400221109 is 901122004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290600209 + 109620900 = 17047^2 + 10470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400221109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400221139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200110554 + 200110555.

It is an arithmetic number, because the mean of its divisors is an integer number (200110555).

Almost surely, 2^400221109 is an apocalyptic number.

It is an amenable number.

400221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

400221109 is an equidigital number, since it uses as much as digits as its factorization.

400221109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 400221109 is about 20005.5269613175. The cubic root of 400221109 is about 736.9420368073.

The spelling of 400221109 in words is "four hundred million, two hundred twenty-one thousand, one hundred nine".