21351200502 has 8 divisors (see below), whose sum is σ = 42702401016. Its totient is φ = 7117066832.

The previous prime is 21351200491. The next prime is 21351200509. The reversal of 21351200502 is 20500215312.

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

21351200502 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351200509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779266703 + ... + 1779266714.

It is an arithmetic number, because the mean of its divisors is an integer number (5337800127).

Almost surely, 2^21351200502 is an apocalyptic number.

21351200502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21351200502 is a wasteful number, since it uses less digits than its factorization.

21351200502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558533422.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21351200502 its reverse (20500215312), we get a palindrome (41851415814).

The spelling of 21351200502 in words is "twenty-one billion, three hundred fifty-one million, two hundred thousand, five hundred two".