21035670672 has 80 divisors (see below), whose sum is σ = 54652404800. Its totient is φ = 6971982336.

The previous prime is 21035670641. The next prime is 21035670673. The reversal of 21035670672 is 27607653012.

It is a self number, because there is not a number n which added to its sum of digits gives 21035670672.

It is not an unprimeable number, because it can be changed into a prime (21035670673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6648963 + ... + 6652125.

It is an arithmetic number, because the mean of its divisors is an integer number (683155060).

Almost surely, 2^21035670672 is an apocalyptic number.

It is an amenable number.

21035670672 is an abundant number, since it is smaller than the sum of its proper divisors (33616734128).

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

21035670672 is a wasteful number, since it uses less digits than its factorization.

21035670672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21035670672 in words is "twenty-one billion, thirty-five million, six hundred seventy thousand, six hundred seventy-two".