221212111010010 has 32 divisors (see below), whose sum is σ = 548035165343232. Its totient is φ = 57086996389440.

The previous prime is 221212111009997. The next prime is 221212111010039. The reversal of 221212111010010 is 10010111212122.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118931241549 + ... + 118931243408.

It is an arithmetic number, because the mean of its divisors is an integer number (17126098916976).

Almost surely, 2^{221212111010010} is an apocalyptic number.

221212111010010 is an abundant number, since it is smaller than the sum of its proper divisors (326823054333222).

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

221212111010010 is a wasteful number, since it uses less digits than its factorization.

221212111010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237862484998.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221212111010010 its reverse (10010111212122), we get a palindrome (231222222222132).

The spelling of 221212111010010 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred eleven million, ten thousand, ten".