21606079145 has 32 divisors (see below), whose sum is σ = 31413774336. Its totient is φ = 13950144000.

The previous prime is 21606079141. The next prime is 21606079147. The reversal of 21606079145 is 54197060612.

It is not a de Polignac number, because 21606079145 - 2² = 21606079141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21606079141) 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, 228956 + ... + 309245.

It is an arithmetic number, because the mean of its divisors is an integer number (981680448).

Almost surely, 2^21606079145 is an apocalyptic number.

It is an amenable number.

21606079145 is a deficient number, since it is larger than the sum of its proper divisors (9807695191).

21606079145 is a wasteful number, since it uses less digits than its factorization.

21606079145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538281.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21606079145 in words is "twenty-one billion, six hundred six million, seventy-nine thousand, one hundred forty-five".