21016011502 has 32 divisors (see below), whose sum is σ = 32235840000. Its totient is φ = 10273586400.

The previous prime is 21016011469. The next prime is 21016011517. The reversal of 21016011502 is 20511061012.

It is a self number, because there is not a number n which added to its sum of digits gives 21016011502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9860977 + ... + 9863107.

It is an arithmetic number, because the mean of its divisors is an integer number (1007370000).

Almost surely, 2^21016011502 is an apocalyptic number.

21016011502 is a deficient number, since it is larger than the sum of its proper divisors (11219828498).

21016011502 is a wasteful number, since it uses less digits than its factorization.

21016011502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21016011502 its reverse (20511061012), we get a palindrome (41527072514).

The spelling of 21016011502 in words is "twenty-one billion, sixteen million, eleven thousand, five hundred two".