21075436582 has 4 divisors (see below), whose sum is σ = 31613154876. Its totient is φ = 10537718290.

The previous prime is 21075436531. The next prime is 21075436631. The reversal of 21075436582 is 28563457012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5268859144 + ... + 5268859147.

It is an arithmetic number, because the mean of its divisors is an integer number (7903288719).

Almost surely, 2^21075436582 is an apocalyptic number.

21075436582 is a deficient number, since it is larger than the sum of its proper divisors (10537718294).

21075436582 is a wasteful number, since it uses less digits than its factorization.

21075436582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10537718293.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 21075436582 in words is "twenty-one billion, seventy-five million, four hundred thirty-six thousand, five hundred eighty-two".