221111212010 has 16 divisors (see below), whose sum is σ = 428615580456. Its totient is φ = 81641062848.

The previous prime is 221111211953. The next prime is 221111212043. The reversal of 221111212010 is 10212111122.

It can be written as a sum of positive squares in 4 ways, for example, as 68083943041 + 153027268969 = 260929^2 + 391187^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850427609 + ... + 850427868.

Almost surely, 2^221111212010 is an apocalyptic number.

221111212010 is a deficient number, since it is larger than the sum of its proper divisors (207504368446).

221111212010 is a wasteful number, since it uses less digits than its factorization.

221111212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700855497.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221111212010 its reverse (10212111122), we get a palindrome (231323323132).

The spelling of 221111212010 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, ten".