221207612 has 12 divisors (see below), whose sum is σ = 387567936. Its totient is φ = 110473920.

The previous prime is 221207611. The next prime is 221207639. The reversal of 221207612 is 216702122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221207611) 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, 28589 + ... + 35492.

It is an arithmetic number, because the mean of its divisors is an integer number (32297328).

Almost surely, 2^221207612 is an apocalyptic number.

It is an amenable number.

221207612 is a deficient number, since it is larger than the sum of its proper divisors (166360324).

221207612 is a wasteful number, since it uses less digits than its factorization.

221207612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64948 (or 64946 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 221207612 is about 14873.0498553592. The cubic root of 221207612 is about 604.7836231895.

Adding to 221207612 its reverse (216702122), we get a palindrome (437909734).

The spelling of 221207612 in words is "two hundred twenty-one million, two hundred seven thousand, six hundred twelve".