211221210220011 has 6 divisors (see below), whose sum is σ = 305097303651140. Its totient is φ = 140814140146668.

The previous prime is 211221210219997. The next prime is 211221210220021. The reversal of 211221210220011 is 110022012122112.

211221210220011 is a `hidden beast` number, since 2 + 1 + 1 + 221 + 210 + 220 + 0 + 11 = 666.

It is not a de Polignac number, because 211221210220011 - 2⁶ = 211221210219947 is a prime.

It is a super-2 number, since 2×211221210220011² (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 (211221210220021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734511678881 + ... + 11734511678898.

Almost surely, 2^{211221210220011} is an apocalyptic number.

211221210220011 is a deficient number, since it is larger than the sum of its proper divisors (93876093431129).

211221210220011 is a wasteful number, since it uses less digits than its factorization.

211221210220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469023357785 (or 23469023357782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211221210220011 its reverse (110022012122112), we get a palindrome (321243222342123).

The spelling of 211221210220011 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, eleven".