21120110220111 has 8 divisors (see below), whose sum is σ = 32183025097344. Its totient is φ = 12068634411480.

The previous prime is 21120110220101. The next prime is 21120110220149. The reversal of 21120110220111 is 11102201102112.

It is a happy number.

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

It is not a de Polignac number, because 21120110220111 - 2¹¹ = 21120110218063 is a prime.

It is a super-2 number, since 2×21120110220111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502859767125 + ... + 502859767166.

It is an arithmetic number, because the mean of its divisors is an integer number (4022878137168).

Almost surely, 2^{21120110220111} is an apocalyptic number.

21120110220111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21120110220111 is a deficient number, since it is larger than the sum of its proper divisors (11062914877233).

21120110220111 is a wasteful number, since it uses less digits than its factorization.

21120110220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005719534301.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21120110220111 its reverse (11102201102112), we get a palindrome (32222311322223).

The spelling of 21120110220111 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, two hundred twenty thousand, one hundred eleven".