221211212010 has 64 divisors (see below), whose sum is σ = 538101577728. Its totient is φ = 58194609984.

The previous prime is 221211211999. The next prime is 221211212017. The reversal of 221211212010 is 10212112122.

221211212010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221211212017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676569 + ... + 948771.

It is an arithmetic number, because the mean of its divisors is an integer number (8407837152).

Almost surely, 2^221211212010 is an apocalyptic number.

221211212010 is an abundant number, since it is smaller than the sum of its proper divisors (316890365718).

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

221211212010 is a wasteful number, since it uses less digits than its factorization.

221211212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272579.

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

Adding to 221211212010 its reverse (10212112122), we get a palindrome (231423324132).

The spelling of 221211212010 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, ten".