21502341403 has 4 divisors (see below), whose sum is σ = 21548984688. Its totient is φ = 21455698120.

The previous prime is 21502341373. The next prime is 21502341437. The reversal of 21502341403 is 30414320512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21502341403 - 2²¹ = 21500244251 is a prime.

It is a super-2 number, since 2×21502341403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21502341463) 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, 23320951 + ... + 23321872.

It is an arithmetic number, because the mean of its divisors is an integer number (5387246172).

Almost surely, 2^21502341403 is an apocalyptic number.

21502341403 is a deficient number, since it is larger than the sum of its proper divisors (46643285).

21502341403 is an equidigital number, since it uses as much as digits as its factorization.

21502341403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46643284.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21502341403 its reverse (30414320512), we get a palindrome (51916661915).

The spelling of 21502341403 in words is "twenty-one billion, five hundred two million, three hundred forty-one thousand, four hundred three".