21075436634 has 16 divisors (see below), whose sum is σ = 36238479936. Its totient is φ = 9005040000.

The previous prime is 21075436631. The next prime is 21075436643. The reversal of 21075436634 is 43663457012.

It is a junction number, because it is equal to n+sod(n) for n = 21075436591 and 21075436600.

It is not an unprimeable number, because it can be changed into a prime (21075436631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2269367 + ... + 2278634.

It is an arithmetic number, because the mean of its divisors is an integer number (2264904996).

Almost surely, 2^21075436634 is an apocalyptic number.

21075436634 is a deficient number, since it is larger than the sum of its proper divisors (15163043302).

21075436634 is a wasteful number, since it uses less digits than its factorization.

21075436634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548341.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 21075436634 in words is "twenty-one billion, seventy-five million, four hundred thirty-six thousand, six hundred thirty-four".