21052055311111 has 24 divisors (see below), whose sum is σ = 24150350361312. Its totient is φ = 18302793960000.

The previous prime is 21052055311087. The next prime is 21052055311193. The reversal of 21052055311111 is 11111355025012.

It is not a de Polignac number, because 21052055311111 - 2²¹ = 21052053213959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21052055311111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052055311811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14621725 + ... + 15996841.

It is an arithmetic number, because the mean of its divisors is an integer number (1006264598388).

Almost surely, 2^{21052055311111} is an apocalyptic number.

21052055311111 is a deficient number, since it is larger than the sum of its proper divisors (3098295050201).

21052055311111 is a wasteful number, since it uses less digits than its factorization.

21052055311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380663 (or 1380652 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 28.

The spelling of 21052055311111 in words is "twenty-one trillion, fifty-two billion, fifty-five million, three hundred eleven thousand, one hundred eleven".