221220225610 has 16 divisors (see below), whose sum is σ = 411041452032. Its totient is φ = 85633635600.

The previous prime is 221220225581. The next prime is 221220225631. The reversal of 221220225610 is 16522022122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356806506 + ... + 356807125.

It is an arithmetic number, because the mean of its divisors is an integer number (25690090752).

Almost surely, 2^221220225610 is an apocalyptic number.

221220225610 is a deficient number, since it is larger than the sum of its proper divisors (189821226422).

221220225610 is a wasteful number, since it uses less digits than its factorization.

221220225610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713613669.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 221220225610 its reverse (16522022122), we get a palindrome (237742247732).

The spelling of 221220225610 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty-five thousand, six hundred ten".