21177504099 has 12 divisors (see below), whose sum is σ = 30591046200. Its totient is φ = 14117727744.

The previous prime is 21177504079. The next prime is 21177504109. The reversal of 21177504099 is 99040577112.

21177504099 is a `hidden beast` number, since 21 + 177 + 50 + 409 + 9 = 666.

It is not a de Polignac number, because 21177504099 - 2⁵ = 21177504067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21177504059) 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 11 ways as a sum of consecutive naturals, for example, 291012 + ... + 356430.

It is an arithmetic number, because the mean of its divisors is an integer number (2549253850).

Almost surely, 2^21177504099 is an apocalyptic number.

21177504099 is a deficient number, since it is larger than the sum of its proper divisors (9413542101).

21177504099 is a wasteful number, since it uses less digits than its factorization.

21177504099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101394 (or 101391 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 21177504099 in words is "twenty-one billion, one hundred seventy-seven million, five hundred four thousand, ninety-nine".