21550001112 has 48 divisors (see below), whose sum is σ = 58371885000. Its totient is φ = 7182435456.

The previous prime is 21550001101. The next prime is 21550001113. The reversal of 21550001112 is 21110005512.

21550001112 is a `hidden beast` number, since 2 + 1 + 550 + 0 + 0 + 1 + 112 = 666.

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 (21550001113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820764 + ... + 846612.

Almost surely, 2^21550001112 is an apocalyptic number.

It is an amenable number.

21550001112 is an abundant number, since it is smaller than the sum of its proper divisors (36821883888).

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

21550001112 is a wasteful number, since it uses less digits than its factorization.

21550001112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37440 (or 37433 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 21550001112 its reverse (21110005512), we get a palindrome (42660006624).

The spelling of 21550001112 in words is "twenty-one billion, five hundred fifty million, one thousand, one hundred twelve".