211221012020011 has 16 divisors (see below), whose sum is σ = 242158494956544. Its totient is φ = 180474582717504.

The previous prime is 211221012019973. The next prime is 211221012020021. The reversal of 211221012020011 is 110020210122112.

It is a cyclic number.

It is not a de Polignac number, because 211221012020011 - 2¹⁵ = 211221011987243 is a prime.

It is a super-2 number, since 2×211221012020011² (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 (211221012020021) 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, 3373635 + ... + 20828428.

It is an arithmetic number, because the mean of its divisors is an integer number (15134905934784).

Almost surely, 2^{211221012020011} is an apocalyptic number.

211221012020011 is a deficient number, since it is larger than the sum of its proper divisors (30937482936533).

211221012020011 is a wasteful number, since it uses less digits than its factorization.

211221012020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24206010.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211221012020011 its reverse (110020210122112), we get a palindrome (321241222142123).

The spelling of 211221012020011 in words is "two hundred eleven trillion, two hundred twenty-one billion, twelve million, twenty thousand, eleven".