21320101111 has 8 divisors (see below), whose sum is σ = 21386046240. Its totient is φ = 21254188032.

The previous prime is 21320101109. The next prime is 21320101133. The reversal of 21320101111 is 11110102312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21320101111 - 2¹ = 21320101109 is a prime.

It is a super-2 number, since 2×21320101111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320101091 and 21320101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320101171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407630 + ... + 2416468.

It is an arithmetic number, because the mean of its divisors is an integer number (2673255780).

Almost surely, 2^21320101111 is an apocalyptic number.

21320101111 is a deficient number, since it is larger than the sum of its proper divisors (65945129).

21320101111 is an equidigital number, since it uses as much as digits as its factorization.

21320101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16025.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21320101111 its reverse (11110102312), we get a palindrome (32430203423).

The spelling of 21320101111 in words is "twenty-one billion, three hundred twenty million, one hundred one thousand, one hundred eleven".