21152443503 has 16 divisors (see below), whose sum is σ = 28296738432. Its totient is φ = 14054964000.

The previous prime is 21152443463. The next prime is 21152443517. The reversal of 21152443503 is 30534425112.

It is not a de Polignac number, because 21152443503 - 2⁶ = 21152443439 is a prime.

It is a super-2 number, since 2×21152443503² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152443553) 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 15 ways as a sum of consecutive naturals, for example, 1200588 + ... + 1218078.

It is an arithmetic number, because the mean of its divisors is an integer number (1768546152).

Almost surely, 2^21152443503 is an apocalyptic number.

21152443503 is a deficient number, since it is larger than the sum of its proper divisors (7144294929).

21152443503 is a wasteful number, since it uses less digits than its factorization.

21152443503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18806.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21152443503 its reverse (30534425112), we get a palindrome (51686868615).

The spelling of 21152443503 in words is "twenty-one billion, one hundred fifty-two million, four hundred forty-three thousand, five hundred three".