221112012210 has 64 divisors (see below), whose sum is σ = 546276939264. Its totient is φ = 57236371200.

The previous prime is 221112012139. The next prime is 221112012283. The reversal of 221112012210 is 12210211122.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221112012210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247320 + ... + 709500.

It is an arithmetic number, because the mean of its divisors is an integer number (8535577176).

Almost surely, 2^221112012210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221112012210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273138469632).

221112012210 is an abundant number, since it is smaller than the sum of its proper divisors (325164927054).

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

221112012210 is a wasteful number, since it uses less digits than its factorization.

221112012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462659.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221112012210 its reverse (12210211122), we get a palindrome (233322223332).

The spelling of 221112012210 in words is "two hundred twenty-one billion, one hundred twelve million, twelve thousand, two hundred ten".