211221021122011 has 4 divisors (see below), whose sum is σ = 214114459767592. Its totient is φ = 208327582476432.

The previous prime is 211221021121973. The next prime is 211221021122029. The reversal of 211221021122011 is 110221120122112.

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 211221021122011 - 2¹³ = 211221021113819 is a prime.

It is a super-2 number, since 2×211221021122011² (a number of 29 digits) contains 22 as substring.

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 211221021122011.

It is not an unprimeable number, because it can be changed into a prime (211221021122081) 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, 1446719322681 + ... + 1446719322826.

It is an arithmetic number, because the mean of its divisors is an integer number (53528614941898).

Almost surely, 2^{211221021122011} is an apocalyptic number.

211221021122011 is a deficient number, since it is larger than the sum of its proper divisors (2893438645581).

211221021122011 is an equidigital number, since it uses as much as digits as its factorization.

211221021122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893438645580.

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

Adding to 211221021122011 its reverse (110221120122112), we get a palindrome (321442141244123).

The spelling of 211221021122011 in words is "two hundred eleven trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, eleven".