21120013203 has 8 divisors (see below), whose sum is σ = 28161797568. Its totient is φ = 14079118824.

The previous prime is 21120013127. The next prime is 21120013241. The reversal of 21120013203 is 30231002112.

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

It is not a de Polignac number, because 21120013203 - 2⁹ = 21120012691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120013283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165001 + ... + 263562.

It is an arithmetic number, because the mean of its divisors is an integer number (3520224696).

Almost surely, 2^21120013203 is an apocalyptic number.

21120013203 is a deficient number, since it is larger than the sum of its proper divisors (7041784365).

21120013203 is a wasteful number, since it uses less digits than its factorization.

21120013203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444993.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21120013203 its reverse (30231002112), we get a palindrome (51351015315).

The spelling of 21120013203 in words is "twenty-one billion, one hundred twenty million, thirteen thousand, two hundred three".