221010212122111 has 4 divisors (see below), whose sum is σ = 221012119290424. Its totient is φ = 221008304953800.

The previous prime is 221010212122099. The next prime is 221010212122151. The reversal of 221010212122111 is 111221212010122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221010212122111 - 2²¹ = 221010210024959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010212122151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953410320 + ... + 953642101.

It is an arithmetic number, because the mean of its divisors is an integer number (55253029822606).

Almost surely, 2^{221010212122111} is an apocalyptic number.

221010212122111 is a deficient number, since it is larger than the sum of its proper divisors (1907168313).

221010212122111 is a wasteful number, since it uses less digits than its factorization.

221010212122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907168312.

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

Adding to 221010212122111 its reverse (111221212010122), we get a palindrome (332231424132233).

The spelling of 221010212122111 in words is "two hundred twenty-one trillion, ten billion, two hundred twelve million, one hundred twenty-two thousand, one hundred eleven".