211211021005 has 16 divisors (see below), whose sum is σ = 255039905664. Its totient is φ = 167911289280.

The previous prime is 211211020991. The next prime is 211211021027. The reversal of 211211021005 is 500120112112.

It is not a de Polignac number, because 211211021005 - 2¹¹ = 211211018957 is a prime.

It is a super-2 number, since 2×211211021005² (a number of 23 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 211211021005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12266112 + ... + 12283318.

It is an arithmetic number, because the mean of its divisors is an integer number (15939994104).

Almost surely, 2^211211021005 is an apocalyptic number.

It is an amenable number.

211211021005 is a deficient number, since it is larger than the sum of its proper divisors (43828884659).

211211021005 is a wasteful number, since it uses less digits than its factorization.

211211021005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32436.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 211211021005 its reverse (500120112112), we get a palindrome (711331133117).

The spelling of 211211021005 in words is "two hundred eleven billion, two hundred eleven million, twenty-one thousand, five".