221001111222211 has 16 divisors (see below), whose sum is σ = 225372137008480. Its totient is φ = 216673580620800.

The previous prime is 221001111222137. The next prime is 221001111222263. The reversal of 221001111222211 is 112222111100122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221001111222211 - 2²¹ = 221001109125059 is a prime.

It is a super-2 number, since 2×221001111222211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001111222271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51884020 + ... + 55981726.

It is an arithmetic number, because the mean of its divisors is an integer number (14085758563030).

Almost surely, 2^{221001111222211} is an apocalyptic number.

221001111222211 is a deficient number, since it is larger than the sum of its proper divisors (4371025786269).

221001111222211 is a wasteful number, since it uses less digits than its factorization.

221001111222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103014.

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

Adding to 221001111222211 its reverse (112222111100122), we get a palindrome (333223222322333).

The spelling of 221001111222211 in words is "two hundred twenty-one trillion, one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".