21012112102011 has 8 divisors (see below), whose sum is σ = 28016227048464. Its totient is φ = 14008035945120.

The previous prime is 21012112102001. The next prime is 21012112102019. The reversal of 21012112102011 is 11020121121012.

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 21012112102011 - 2¹⁵ = 21012112069243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012112102019) 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, 8408980 + ... + 10617681.

It is an arithmetic number, because the mean of its divisors is an integer number (3502028381058).

Almost surely, 2^{21012112102011} is an apocalyptic number.

21012112102011 is a deficient number, since it is larger than the sum of its proper divisors (7004114946453).

21012112102011 is a wasteful number, since it uses less digits than its factorization.

21012112102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19394781.

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

Adding to 21012112102011 its reverse (11020121121012), we get a palindrome (32032233223023).

The spelling of 21012112102011 in words is "twenty-one trillion, twelve billion, one hundred twelve million, one hundred two thousand, eleven".