21011363403 has 4 divisors (see below), whose sum is σ = 28015151208. Its totient is φ = 14007575600.

The previous prime is 21011363381. The next prime is 21011363411. The reversal of 21011363403 is 30436311012.

It is a happy number.

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 21011363403 - 2⁸ = 21011363147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011363423) 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, 3501893898 + ... + 3501893903.

It is an arithmetic number, because the mean of its divisors is an integer number (7003787802).

Almost surely, 2^21011363403 is an apocalyptic number.

21011363403 is a deficient number, since it is larger than the sum of its proper divisors (7003787805).

21011363403 is an equidigital number, since it uses as much as digits as its factorization.

21011363403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003787804.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21011363403 its reverse (30436311012), we get a palindrome (51447674415).

The spelling of 21011363403 in words is "twenty-one billion, eleven million, three hundred sixty-three thousand, four hundred three".