21405521134 has 8 divisors (see below), whose sum is σ = 33997004208. Its totient is φ = 10073186400.

The previous prime is 21405521107. The next prime is 21405521171. The reversal of 21405521134 is 43112550412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314787042 + ... + 314787109.

It is an arithmetic number, because the mean of its divisors is an integer number (4249625526).

Almost surely, 2^21405521134 is an apocalyptic number.

21405521134 is a deficient number, since it is larger than the sum of its proper divisors (12591483074).

21405521134 is a wasteful number, since it uses less digits than its factorization.

21405521134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629574170.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21405521134 in words is "twenty-one billion, four hundred five million, five hundred twenty-one thousand, one hundred thirty-four".