21115242502 has 8 divisors (see below), whose sum is σ = 31705285176. Its totient is φ = 10546814112.

The previous prime is 21115242497. The next prime is 21115242523. The reversal of 21115242502 is 20524251112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5401128 + ... + 5405035.

It is an arithmetic number, because the mean of its divisors is an integer number (3963160647).

Almost surely, 2^21115242502 is an apocalyptic number.

21115242502 is a deficient number, since it is larger than the sum of its proper divisors (10590042674).

21115242502 is a wasteful number, since it uses less digits than its factorization.

21115242502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807142.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21115242502 its reverse (20524251112), we get a palindrome (41639493614).

The spelling of 21115242502 in words is "twenty-one billion, one hundred fifteen million, two hundred forty-two thousand, five hundred two".