21152403003 has 8 divisors (see below), whose sum is σ = 29175728400. Its totient is φ = 13615339808.

The previous prime is 21152403001. The next prime is 21152403037. The reversal of 21152403003 is 30030425112.

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

It is a cyclic number.

It is not a de Polignac number, because 21152403003 - 2¹ = 21152403001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152403001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121565448 + ... + 121565621.

It is an arithmetic number, because the mean of its divisors is an integer number (3646966050).

Almost surely, 2^21152403003 is an apocalyptic number.

21152403003 is a deficient number, since it is larger than the sum of its proper divisors (8023325397).

21152403003 is a wasteful number, since it uses less digits than its factorization.

21152403003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243131101.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21152403003 its reverse (30030425112), we get a palindrome (51182828115).

The spelling of 21152403003 in words is "twenty-one billion, one hundred fifty-two million, four hundred three thousand, three".