21105041361 has 16 divisors (see below), whose sum is σ = 28316712960. Its totient is φ = 13981807440.

The previous prime is 21105041329. The next prime is 21105041371. The reversal of 21105041361 is 16314050112.

It is a happy number.

It is not a de Polignac number, because 21105041361 - 2⁵ = 21105041329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21105041371) 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, 815856 + ... + 841326.

It is an arithmetic number, because the mean of its divisors is an integer number (1769794560).

Almost surely, 2^21105041361 is an apocalyptic number.

It is an amenable number.

21105041361 is a deficient number, since it is larger than the sum of its proper divisors (7211671599).

21105041361 is a wasteful number, since it uses less digits than its factorization.

21105041361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27196.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21105041361 its reverse (16314050112), we get a palindrome (37419091473).

The spelling of 21105041361 in words is "twenty-one billion, one hundred five million, forty-one thousand, three hundred sixty-one".