21102026454 has 24 divisors (see below), whose sum is σ = 45729086832. Its totient is φ = 7032773520.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026454 is 45462020112.

21102026454 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 202 + 6 + 454 = 666.

21102026454 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102026459) 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, 5487 + ... + 205509.

It is an arithmetic number, because the mean of its divisors is an integer number (1905378618).

Almost surely, 2^21102026454 is an apocalyptic number.

21102026454 is an abundant number, since it is smaller than the sum of its proper divisors (24627060378).

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

21102026454 is a wasteful number, since it uses less digits than its factorization.

21102026454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205892 (or 205889 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21102026454 its reverse (45462020112), we get a palindrome (66564046566).

The spelling of 21102026454 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred fifty-four".