21120211101 has 16 divisors (see below), whose sum is σ = 31024473408. Its totient is φ = 12673392000.

The previous prime is 21120211093. The next prime is 21120211181. The reversal of 21120211101 is 10111202112.

It is not a de Polignac number, because 21120211101 - 2³ = 21120211093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211181) 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, 3165016 + ... + 3171681.

It is an arithmetic number, because the mean of its divisors is an integer number (1939029588).

Almost surely, 2^21120211101 is an apocalyptic number.

It is an amenable number.

21120211101 is a deficient number, since it is larger than the sum of its proper divisors (9904262307).

21120211101 is a wasteful number, since it uses less digits than its factorization.

21120211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6336812.

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

Adding to 21120211101 its reverse (10111202112), we get a palindrome (31231413213).

It can be divided in two parts, 21120 and 211101, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21120211101 in words is "twenty-one billion, one hundred twenty million, two hundred eleven thousand, one hundred one".