21112110036 has 18 divisors (see below), whose sum is σ = 53366722682. Its totient is φ = 7037370000.

The previous prime is 21112110031. The next prime is 21112110037. The reversal of 21112110036 is 63001121112.

It can be written as a sum of positive squares in only one way, i.e., 19060563600 + 2051546436 = 138060^2 + 45294^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112110031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293223715 + ... + 293223786.

Almost surely, 2^21112110036 is an apocalyptic number.

It is an amenable number.

21112110036 is an abundant number, since it is smaller than the sum of its proper divisors (32254612646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112110036 is a wasteful number, since it uses less digits than its factorization.

21112110036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586447511 (or 586447506 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21112110036 its reverse (63001121112), we get a palindrome (84113231148).

The spelling of 21112110036 in words is "twenty-one billion, one hundred twelve million, one hundred ten thousand, thirty-six".