21102011211 has 24 divisors (see below), whose sum is σ = 30673414720. Its totient is φ = 12867984864.

The previous prime is 21102011191. The next prime is 21102011233. The reversal of 21102011211 is 11211020112.

It is not a de Polignac number, because 21102011211 - 2¹³ = 21102003019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102013211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172165 + ... + 268038.

Almost surely, 2^21102011211 is an apocalyptic number.

21102011211 is a deficient number, since it is larger than the sum of its proper divisors (9571403509).

21102011211 is a wasteful number, since it uses less digits than its factorization.

21102011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440283 (or 440254 counting only the distinct ones).

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

Adding to 21102011211 its reverse (11211020112), we get a palindrome (32313031323).

It can be divided in two parts, 211020112 and 11, that multiplied together give a palindrome (2321221232).

The spelling of 21102011211 in words is "twenty-one billion, one hundred two million, eleven thousand, two hundred eleven".