21005632134 has 48 divisors (see below), whose sum is σ = 48257380080. Its totient is φ = 6584924160.

The previous prime is 21005632111. The next prime is 21005632181. The reversal of 21005632134 is 43123650012.

21005632134 is a `hidden beast` number, since 2 + 10 + 0 + 5 + 632 + 13 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21005632098 and 21005632107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177307 + ... + 271014.

It is an arithmetic number, because the mean of its divisors is an integer number (1005362085).

Almost surely, 2^21005632134 is an apocalyptic number.

21005632134 is an abundant number, since it is smaller than the sum of its proper divisors (27251747946).

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

21005632134 is a wasteful number, since it uses less digits than its factorization.

21005632134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448485 (or 448482 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 21005632134 in words is "twenty-one billion, five million, six hundred thirty-two thousand, one hundred thirty-four".