221971296 has 24 divisors (see below), whose sum is σ = 582674904. Its totient is φ = 73990400.

The previous prime is 221971291. The next prime is 221971297. The reversal of 221971296 is 692179122.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221971291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156005 + ... + 1156196.

It is an arithmetic number, because the mean of its divisors is an integer number (24278121).

Almost surely, 2^221971296 is an apocalyptic number.

It is an amenable number.

221971296 is an abundant number, since it is smaller than the sum of its proper divisors (360703608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221971296 is a wasteful number, since it uses less digits than its factorization.

221971296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312214 (or 2312206 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 221971296 is about 14898.7011514427. The cubic root of 221971296 is about 605.4787968108.

The spelling of 221971296 in words is "two hundred twenty-one million, nine hundred seventy-one thousand, two hundred ninety-six".