21112115454 has 16 divisors (see below), whose sum is σ = 46915812240. Its totient is φ = 7037371800.

The previous prime is 21112115443. The next prime is 21112115459. The reversal of 21112115454 is 45451121112.

21112115454 is a `hidden beast` number, since 2 + 1 + 112 + 1 + 1 + 545 + 4 = 666.

21112115454 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21112115454² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112115459) 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, 195482497 + ... + 195482604.

It is an arithmetic number, because the mean of its divisors is an integer number (2932238265).

Almost surely, 2^21112115454 is an apocalyptic number.

21112115454 is an abundant number, since it is smaller than the sum of its proper divisors (25803696786).

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

21112115454 is a wasteful number, since it uses less digits than its factorization.

21112115454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390965112 (or 390965106 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

Adding to 21112115454 its reverse (45451121112), we get a palindrome (66563236566).

The spelling of 21112115454 in words is "twenty-one billion, one hundred twelve million, one hundred fifteen thousand, four hundred fifty-four".