21012120112011 has 8 divisors (see below), whose sum is σ = 32018468742144. Its totient is φ = 12006925778280.

The previous prime is 21012120111989. The next prime is 21012120112069. The reversal of 21012120112011 is 11021102121012.

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 21012120112011 - 2¹⁴ = 21012120095627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012120112411) 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, 500288574075 + ... + 500288574116.

It is an arithmetic number, because the mean of its divisors is an integer number (4002308592768).

Almost surely, 2^{21012120112011} is an apocalyptic number.

21012120112011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21012120112011 is a deficient number, since it is larger than the sum of its proper divisors (11006348630133).

21012120112011 is a wasteful number, since it uses less digits than its factorization.

21012120112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000577148201.

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

Adding to 21012120112011 its reverse (11021102121012), we get a palindrome (32033222233023).

The spelling of 21012120112011 in words is "twenty-one trillion, twelve billion, one hundred twenty million, one hundred twelve thousand, eleven".