221212122111010 has 64 divisors (see below), whose sum is σ = 407913428507904. Its totient is φ = 86327050118400.

The previous prime is 221212122110971. The next prime is 221212122111031. The reversal of 221212122111010 is 10111221212122.

It is a happy number.

221212122111010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5997002787 + ... + 5997039673.

It is an arithmetic number, because the mean of its divisors is an integer number (6373647320436).

Almost surely, 2^{221212122111010} is an apocalyptic number.

221212122111010 is a deficient number, since it is larger than the sum of its proper divisors (186701306396894).

221212122111010 is a wasteful number, since it uses less digits than its factorization.

221212122111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52699.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221212122111010 its reverse (10111221212122), we get a palindrome (231323343323132).

The spelling of 221212122111010 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred eleven thousand, ten".