221441629 has 2 divisors, whose sum is σ = 221441630. Its totient is φ = 221441628.

The previous prime is 221441621. The next prime is 221441639. The reversal of 221441629 is 926144122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163712025 + 57729604 = 12795^2 + 7598^2 .

It is a cyclic number.

It is not a de Polignac number, because 221441629 - 2³ = 221441621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221441629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221441621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720814 + 110720815.

It is an arithmetic number, because the mean of its divisors is an integer number (110720815).

Almost surely, 2^221441629 is an apocalyptic number.

It is an amenable number.

221441629 is a deficient number, since it is larger than the sum of its proper divisors (1).

221441629 is an equidigital number, since it uses as much as digits as its factorization.

221441629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 221441629 is about 14880.9149248291. The cubic root of 221441629 is about 604.9968162299.

The spelling of 221441629 in words is "two hundred twenty-one million, four hundred forty-one thousand, six hundred twenty-nine".