21040515503 has 8 divisors (see below), whose sum is σ = 24058324608. Its totient is φ = 18025711704.

The previous prime is 21040515499. The next prime is 21040515533. The reversal of 21040515503 is 30551504012.

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

It is not a de Polignac number, because 21040515503 - 2² = 21040515499 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 (21040515533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736301 + ... + 764342.

It is an arithmetic number, because the mean of its divisors is an integer number (3007290576).

Almost surely, 2^21040515503 is an apocalyptic number.

21040515503 is a deficient number, since it is larger than the sum of its proper divisors (3017809105).

21040515503 is a wasteful number, since it uses less digits than its factorization.

21040515503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502653.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21040515503 in words is "twenty-one billion, forty million, five hundred fifteen thousand, five hundred three".