21051451303 has 4 divisors (see below), whose sum is σ = 21068665488. Its totient is φ = 21034237120.

The previous prime is 21051451243. The next prime is 21051451307. The reversal of 21051451303 is 30315415012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21051451303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051451307) 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, 8605258 + ... + 8607703.

It is an arithmetic number, because the mean of its divisors is an integer number (5267166372).

Almost surely, 2^21051451303 is an apocalyptic number.

21051451303 is a deficient number, since it is larger than the sum of its proper divisors (17214185).

21051451303 is a wasteful number, since it uses less digits than its factorization.

21051451303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17214184.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21051451303 its reverse (30315415012), we get a palindrome (51366866315).

The spelling of 21051451303 in words is "twenty-one billion, fifty-one million, four hundred fifty-one thousand, three hundred three".