21454554335523 has 32 divisors (see below), whose sum is σ = 30044813544000. Its totient is φ = 13603133846016.

The previous prime is 21454554335519. The next prime is 21454554335587. The reversal of 21454554335523 is 32553345545412.

It is not a de Polignac number, because 21454554335523 - 2² = 21454554335519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454554335503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5196048 + ... + 8361101.

It is an arithmetic number, because the mean of its divisors is an integer number (938900423250).

Almost surely, 2^{21454554335523} is an apocalyptic number.

21454554335523 is a deficient number, since it is larger than the sum of its proper divisors (8590259208477).

21454554335523 is a wasteful number, since it uses less digits than its factorization.

21454554335523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557511.

The product of its digits is 21600000, while the sum is 51.

The spelling of 21454554335523 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred fifty-four million, three hundred thirty-five thousand, five hundred twenty-three".