221211012212011 has 4 divisors (see below), whose sum is σ = 223876205130312. Its totient is φ = 218545819293712.

The previous prime is 221211012211927. The next prime is 221211012212027. The reversal of 221211012212011 is 110212210112122.

It is a happy number.

221211012212011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221211012212011 - 2⁴⁷ = 80473523856683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221211012212011.

It is not an unprimeable number, because it can be changed into a prime (221211012272011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332596459026 + ... + 1332596459191.

It is an arithmetic number, because the mean of its divisors is an integer number (55969051282578).

Almost surely, 2^{221211012212011} is an apocalyptic number.

221211012212011 is a deficient number, since it is larger than the sum of its proper divisors (2665192918301).

221211012212011 is an equidigital number, since it uses as much as digits as its factorization.

221211012212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665192918300.

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

Adding to 221211012212011 its reverse (110212210112122), we get a palindrome (331423222324133).

The spelling of 221211012212011 in words is "two hundred twenty-one trillion, two hundred eleven billion, twelve million, two hundred twelve thousand, eleven".