21563116042611 has 48 divisors (see below), whose sum is σ = 34603585316352. Its totient is φ = 11835672451200.

The previous prime is 21563116042609. The next prime is 21563116042621. The reversal of 21563116042611 is 11624061136512.

It is not a de Polignac number, because 21563116042611 - 2¹ = 21563116042609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 21563116042611.

It is not an unprimeable number, because it can be changed into a prime (21563116042621) 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, 36180235 + ... + 36771396.

It is an arithmetic number, because the mean of its divisors is an integer number (720908027424).

Almost surely, 2^{21563116042611} is an apocalyptic number.

21563116042611 is a deficient number, since it is larger than the sum of its proper divisors (13040469273741).

21563116042611 is a wasteful number, since it uses less digits than its factorization.

21563116042611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72951724 (or 72951711 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 21563116042611 in words is "twenty-one trillion, five hundred sixty-three billion, one hundred sixteen million, forty-two thousand, six hundred eleven".