21120012101011 has 8 divisors (see below), whose sum is σ = 21123306954848. Its totient is φ = 21116717496000.

The previous prime is 21120012100987. The next prime is 21120012101033. The reversal of 21120012101011 is 11010121002112.

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 21120012101011 - 2¹¹ = 21120012098963 is a prime.

It is a super-2 number, since 2×21120012101011² (a number of 27 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 = 21120012100982 and 21120012101000.

It is not an unprimeable number, because it can be changed into a prime (21120012101711) 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, 232987666 + ... + 233078296.

It is an arithmetic number, because the mean of its divisors is an integer number (2640413369356).

Almost surely, 2^{21120012101011} is an apocalyptic number.

21120012101011 is a deficient number, since it is larger than the sum of its proper divisors (3294853837).

21120012101011 is an equidigital number, since it uses as much as digits as its factorization.

21120012101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124413.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21120012101011 its reverse (11010121002112), we get a palindrome (32130133103123).

The spelling of 21120012101011 in words is "twenty-one trillion, one hundred twenty billion, twelve million, one hundred one thousand, eleven".