21013050502 has 8 divisors (see below), whose sum is σ = 31720337856. Its totient is φ = 10439604552.

The previous prime is 21013050491. The next prime is 21013050517. The reversal of 21013050502 is 20505031012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21013050502.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 33459958 + ... + 33460585.

It is an arithmetic number, because the mean of its divisors is an integer number (3965042232).

Almost surely, 2^21013050502 is an apocalyptic number.

21013050502 is a deficient number, since it is larger than the sum of its proper divisors (10707287354).

21013050502 is a wasteful number, since it uses less digits than its factorization.

21013050502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66920702.

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 21013050502 its reverse (20505031012), we get a palindrome (41518081514).

The spelling of 21013050502 in words is "twenty-one billion, thirteen million, fifty thousand, five hundred two".