21111301211 has 32 divisors (see below), whose sum is σ = 28733634048. Its totient is φ = 14976887040.

The previous prime is 21111301171. The next prime is 21111301213. The reversal of 21111301211 is 11210311112.

It is a cyclic number.

It is not a de Polignac number, because 21111301211 - 2¹⁰ = 21111300187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111301213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71381 + ... + 217526.

It is an arithmetic number, because the mean of its divisors is an integer number (897926064).

Almost surely, 2^21111301211 is an apocalyptic number.

21111301211 is a deficient number, since it is larger than the sum of its proper divisors (7622332837).

21111301211 is a wasteful number, since it uses less digits than its factorization.

21111301211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289011.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21111301211 its reverse (11210311112), we get a palindrome (32321612323).

Subtracting from 21111301211 its reverse (11210311112), we obtain a palindrome (9900990099).

The spelling of 21111301211 in words is "twenty-one billion, one hundred eleven million, three hundred one thousand, two hundred eleven".