21405032134 has 16 divisors (see below), whose sum is σ = 32987071008. Its totient is φ = 10409548032.

The previous prime is 21405032123. The next prime is 21405032147. The reversal of 21405032134 is 43123050412.

It is a junction number, because it is equal to n+sod(n) for n = 21405032099 and 21405032108.

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 7 ways as a sum of consecutive naturals, for example, 163542 + ... + 263734.

It is an arithmetic number, because the mean of its divisors is an integer number (2061691938).

Almost surely, 2^21405032134 is an apocalyptic number.

21405032134 is a deficient number, since it is larger than the sum of its proper divisors (11582038874).

21405032134 is a wasteful number, since it uses less digits than its factorization.

21405032134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103119.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21405032134 its reverse (43123050412), we get a palindrome (64528082546).

The spelling of 21405032134 in words is "twenty-one billion, four hundred five million, thirty-two thousand, one hundred thirty-four".