221001210012 has 96 divisors (see below), whose sum is σ = 579198461184. Its totient is φ = 64996992000.

The previous prime is 221001210011. The next prime is 221001210019. The reversal of 221001210012 is 210012100122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 221001210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001210011) 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, 1902063 + ... + 2014905.

It is an arithmetic number, because the mean of its divisors is an integer number (6033317304).

Almost surely, 2^221001210012 is an apocalyptic number.

221001210012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221001210012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289599230592).

221001210012 is an abundant number, since it is smaller than the sum of its proper divisors (358197251172).

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

221001210012 is a wasteful number, since it uses less digits than its factorization.

221001210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113299 (or 113297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221001210012 its reverse (210012100122), we get a palindrome (431013310134).

It can be divided in two parts, 2 and 21001210012, that multiplied together give a palindrome (42002420024).

The spelling of 221001210012 in words is "two hundred twenty-one billion, one million, two hundred ten thousand, twelve".