21359072553 has 32 divisors (see below), whose sum is σ = 35494502400. Its totient is φ = 11123701056.

The previous prime is 21359072551. The next prime is 21359072573. The reversal of 21359072553 is 35527095312.

It is not a de Polignac number, because 21359072553 - 2¹ = 21359072551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21359072551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473613 + ... + 516746.

It is an arithmetic number, because the mean of its divisors is an integer number (1109203200).

Almost surely, 2^21359072553 is an apocalyptic number.

It is an amenable number.

21359072553 is a deficient number, since it is larger than the sum of its proper divisors (14135429847).

21359072553 is a wasteful number, since it uses less digits than its factorization.

21359072553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990461.

The product of its (nonzero) digits is 283500, while the sum is 42.

The spelling of 21359072553 in words is "twenty-one billion, three hundred fifty-nine million, seventy-two thousand, five hundred fifty-three".