21012112001111 has 48 divisors (see below), whose sum is σ = 26749611168000. Its totient is φ = 16153879610880.

The previous prime is 21012112001107. The next prime is 21012112001129. The reversal of 21012112001111 is 11110021121012.

It is not a de Polignac number, because 21012112001111 - 2² = 21012112001107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012112001171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51750215 + ... + 52154663.

It is an arithmetic number, because the mean of its divisors is an integer number (557283566000).

Almost surely, 2^{21012112001111} is an apocalyptic number.

21012112001111 is a deficient number, since it is larger than the sum of its proper divisors (5737499166889).

21012112001111 is a wasteful number, since it uses less digits than its factorization.

21012112001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405300 (or 405289 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21012112001111 its reverse (11110021121012), we get a palindrome (32122133122123).

The spelling of 21012112001111 in words is "twenty-one trillion, twelve billion, one hundred twelve million, one thousand, one hundred eleven".