221421651589 has 2 divisors, whose sum is σ = 221421651590. Its totient is φ = 221421651588.

The previous prime is 221421651569. The next prime is 221421651707. The reversal of 221421651589 is 985156124122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214607974564 + 6813677025 = 463258^2 + 82545^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421651589 - 2²¹ = 221419554437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421651509) 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, 110710825794 + 110710825795.

It is an arithmetic number, because the mean of its divisors is an integer number (110710825795).

Almost surely, 2^221421651589 is an apocalyptic number.

It is an amenable number.

221421651589 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421651589 is an equidigital number, since it uses as much as digits as its factorization.

221421651589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 46.

The spelling of 221421651589 in words is "two hundred twenty-one billion, four hundred twenty-one million, six hundred fifty-one thousand, five hundred eighty-nine".