21102011101211 has 4 divisors (see below), whose sum is σ = 21106043594712. Its totient is φ = 21097978607712.

The previous prime is 21102011101183. The next prime is 21102011101219. The reversal of 21102011101211 is 11210111020112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21102011101211 - 2³⁴ = 21084831232027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102011101219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016238901 + ... + 2016249366.

It is an arithmetic number, because the mean of its divisors is an integer number (5276510898678).

Almost surely, 2^{21102011101211} is an apocalyptic number.

21102011101211 is a deficient number, since it is larger than the sum of its proper divisors (4032493501).

21102011101211 is an equidigital number, since it uses as much as digits as its factorization.

21102011101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032493500.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21102011101211 its reverse (11210111020112), we get a palindrome (32312122121323).

The spelling of 21102011101211 in words is "twenty-one trillion, one hundred two billion, eleven million, one hundred one thousand, two hundred eleven".