21012110211 has 16 divisors (see below), whose sum is σ = 29675679264. Its totient is φ = 13178947584.

The previous prime is 21012110209. The next prime is 21012110257. The reversal of 21012110211 is 11201121012.

It is not a de Polignac number, because 21012110211 - 2¹ = 21012110209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012110201) 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, 54751 + ... + 212183.

It is an arithmetic number, because the mean of its divisors is an integer number (1854729954).

Almost surely, 2^21012110211 is an apocalyptic number.

21012110211 is a deficient number, since it is larger than the sum of its proper divisors (8663569053).

21012110211 is a wasteful number, since it uses less digits than its factorization.

21012110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160070.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012110211 its reverse (11201121012), we get a palindrome (32213231223).

The spelling of 21012110211 in words is "twenty-one billion, twelve million, one hundred ten thousand, two hundred eleven".