21120242403 has 8 divisors (see below), whose sum is σ = 30326501968. Its totient is φ = 12997072224.

The previous prime is 21120242393. The next prime is 21120242443. The reversal of 21120242403 is 30424202112.

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

It is not a de Polignac number, because 21120242403 - 2¹⁴ = 21120226019 is a prime.

It is a super-2 number, since 2×21120242403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120242403.

It is not an unprimeable number, because it can be changed into a prime (21120242443) 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, 270772300 + ... + 270772377.

It is an arithmetic number, because the mean of its divisors is an integer number (3790812746).

Almost surely, 2^21120242403 is an apocalyptic number.

21120242403 is a deficient number, since it is larger than the sum of its proper divisors (9206259565).

21120242403 is a wasteful number, since it uses less digits than its factorization.

21120242403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541544693.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21120242403 its reverse (30424202112), we get a palindrome (51544444515).

The spelling of 21120242403 in words is "twenty-one billion, one hundred twenty million, two hundred forty-two thousand, four hundred three".