21105063511 has 16 divisors (see below), whose sum is σ = 25218316800. Its totient is φ = 17269468128.

The previous prime is 21105063479. The next prime is 21105063521. The reversal of 21105063511 is 11536050112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21105063511 - 2⁵ = 21105063479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105063521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46821 + ... + 210718.

It is an arithmetic number, because the mean of its divisors is an integer number (1576144800).

Almost surely, 2^21105063511 is an apocalyptic number.

21105063511 is a deficient number, since it is larger than the sum of its proper divisors (4113253289).

21105063511 is a wasteful number, since it uses less digits than its factorization.

21105063511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258078.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 21105063511 in words is "twenty-one billion, one hundred five million, sixty-three thousand, five hundred eleven".