164447101221 has 16 divisors (see below), whose sum is σ = 238467089280. Its totient is φ = 100196251200.

The previous prime is 164447101211. The next prime is 164447101237. The reversal of 164447101221 is 122101744461.

It is not a de Polignac number, because 164447101221 - 2³³ = 155857166629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164447101211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20870281 + ... + 20878158.

It is an arithmetic number, because the mean of its divisors is an integer number (14904193080).

Almost surely, 2^164447101221 is an apocalyptic number.

It is an amenable number.

164447101221 is a deficient number, since it is larger than the sum of its proper divisors (74019988059).

164447101221 is a wasteful number, since it uses less digits than its factorization.

164447101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41748556.

The product of its (nonzero) digits is 10752, while the sum is 33.

Adding to 164447101221 its reverse (122101744461), we get a palindrome (286548845682).

The spelling of 164447101221 in words is "one hundred sixty-four billion, four hundred forty-seven million, one hundred one thousand, two hundred twenty-one".