221489965387 has 4 divisors (see below), whose sum is σ = 221600106616. Its totient is φ = 221379824160.

The previous prime is 221489965369. The next prime is 221489965409. The reversal of 221489965387 is 783569984122.

221489965387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221489965387 - 2¹⁵ = 221489932619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221489960387) 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 in 3 ways as a sum of consecutive naturals, for example, 55067598 + ... + 55071619.

It is an arithmetic number, because the mean of its divisors is an integer number (55400026654).

Almost surely, 2^221489965387 is an apocalyptic number.

221489965387 is a deficient number, since it is larger than the sum of its proper divisors (110141229).

221489965387 is a wasteful number, since it uses less digits than its factorization.

221489965387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110141228.

The product of its digits is 52254720, while the sum is 64.

The spelling of 221489965387 in words is "two hundred twenty-one billion, four hundred eighty-nine million, nine hundred sixty-five thousand, three hundred eighty-seven".