21012101001111 has 16 divisors (see below), whose sum is σ = 30608469192960. Its totient is φ = 12715684504320.

The previous prime is 21012101001083. The next prime is 21012101001113. The reversal of 21012101001111 is 11110010121012.

It is not a de Polignac number, because 21012101001111 - 2¹⁰ = 21012101000087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012101001113) 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 15 ways as a sum of consecutive naturals, for example, 473031531 + ... + 473075948.

It is an arithmetic number, because the mean of its divisors is an integer number (1913029324560).

Almost surely, 2^{21012101001111} is an apocalyptic number.

21012101001111 is a deficient number, since it is larger than the sum of its proper divisors (9596368191849).

21012101001111 is a wasteful number, since it uses less digits than its factorization.

21012101001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946108166.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21012101001111 its reverse (11110010121012), we get a palindrome (32122111122123).

The spelling of 21012101001111 in words is "twenty-one trillion, twelve billion, one hundred one million, one thousand, one hundred eleven".