21125304633 has 8 divisors (see below), whose sum is σ = 28182842208. Its totient is φ = 14075651744.

The previous prime is 21125304631. The next prime is 21125304719. The reversal of 21125304633 is 33640352112.

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

It is a cyclic number.

It is not a de Polignac number, because 21125304633 - 2¹ = 21125304631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21125304633.

It is not an unprimeable number, because it can be changed into a prime (21125304631) 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 7 ways as a sum of consecutive naturals, for example, 1964916 + ... + 1975637.

It is an arithmetic number, because the mean of its divisors is an integer number (3522855276).

Almost surely, 2^21125304633 is an apocalyptic number.

It is an amenable number.

21125304633 is a deficient number, since it is larger than the sum of its proper divisors (7057537575).

21125304633 is a wasteful number, since it uses less digits than its factorization.

21125304633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942343.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21125304633 its reverse (33640352112), we get a palindrome (54765656745).

The spelling of 21125304633 in words is "twenty-one billion, one hundred twenty-five million, three hundred four thousand, six hundred thirty-three".