21221311101 has 32 divisors (see below), whose sum is σ = 29211840000. Its totient is φ = 13697508288.

The previous prime is 21221311099. The next prime is 21221311171. The reversal of 21221311101 is 10111312212.

It is not a de Polignac number, because 21221311101 - 2¹ = 21221311099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221311171) 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, 5125090 + ... + 5129228.

It is an arithmetic number, because the mean of its divisors is an integer number (912870000).

Almost surely, 2^21221311101 is an apocalyptic number.

It is an amenable number.

21221311101 is a deficient number, since it is larger than the sum of its proper divisors (7990528899).

21221311101 is a wasteful number, since it uses less digits than its factorization.

21221311101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4633.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21221311101 its reverse (10111312212), we get a palindrome (31332623313).

The spelling of 21221311101 in words is "twenty-one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred one".