21110540365 has 8 divisors (see below), whose sum is σ = 26017314840. Its totient is φ = 16431988032.

The previous prime is 21110540327. The next prime is 21110540369. The reversal of 21110540365 is 56304501112.

It can be written as a sum of positive squares in 4 ways, for example, as 1870908516 + 19239631849 = 43254^2 + 138707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21110540365 - 2¹⁹ = 21110016077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110540369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57055330 + ... + 57055699.

It is an arithmetic number, because the mean of its divisors is an integer number (3252164355).

Almost surely, 2^21110540365 is an apocalyptic number.

It is an amenable number.

21110540365 is a deficient number, since it is larger than the sum of its proper divisors (4906774475).

21110540365 is a wasteful number, since it uses less digits than its factorization.

21110540365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114111071.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21110540365 in words is "twenty-one billion, one hundred ten million, five hundred forty thousand, three hundred sixty-five".