221222001210 has 64 divisors (see below), whose sum is σ = 606853700352. Its totient is φ = 50558916096.

The previous prime is 221222001191. The next prime is 221222001211. The reversal of 221222001210 is 12100222122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221222001210.

It is not an unprimeable number, because it can be changed into a prime (221222001211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1808302 + ... + 1926758.

It is an arithmetic number, because the mean of its divisors is an integer number (9482089068).

Almost surely, 2^221222001210 is an apocalyptic number.

221222001210 is an abundant number, since it is smaller than the sum of its proper divisors (385631699142).

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

221222001210 is a wasteful number, since it uses less digits than its factorization.

221222001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127367.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221222001210 its reverse (12100222122), we get a palindrome (233322223332).

The spelling of 221222001210 in words is "two hundred twenty-one billion, two hundred twenty-two million, one thousand, two hundred ten".