21513541212003 has 16 divisors (see below), whose sum is σ = 30194542414080. Its totient is φ = 13587455339424.

The previous prime is 21513541211963. The next prime is 21513541212083. The reversal of 21513541212003 is 30021214531512.

It is a happy number.

It is not a de Polignac number, because 21513541212003 - 2²² = 21513537017699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21513541212083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32008225 + ... + 32673437.

It is an arithmetic number, because the mean of its divisors is an integer number (1887158900880).

Almost surely, 2^{21513541212003} is an apocalyptic number.

21513541212003 is a deficient number, since it is larger than the sum of its proper divisors (8681001202077).

21513541212003 is a wasteful number, since it uses less digits than its factorization.

21513541212003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232618.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21513541212003 its reverse (30021214531512), we get a palindrome (51534755743515).

The spelling of 21513541212003 in words is "twenty-one trillion, five hundred thirteen billion, five hundred forty-one million, two hundred twelve thousand, three".