221010121211 has 32 divisors (see below), whose sum is σ = 249250659840. Its totient is φ = 194243961600.

The previous prime is 221010121207. The next prime is 221010121229. The reversal of 221010121211 is 112121010122.

It is a cyclic number.

It is not a de Polignac number, because 221010121211 - 2² = 221010121207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221010121231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66347816 + ... + 66351146.

It is an arithmetic number, because the mean of its divisors is an integer number (7789083120).

Almost surely, 2^221010121211 is an apocalyptic number.

221010121211 is a deficient number, since it is larger than the sum of its proper divisors (28240538629).

221010121211 is a wasteful number, since it uses less digits than its factorization.

221010121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027.

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

Adding to 221010121211 its reverse (112121010122), we get a palindrome (333131131333).

The spelling of 221010121211 in words is "two hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred eleven".