21213440024403 has 16 divisors (see below), whose sum is σ = 31573492131456. Its totient is φ = 12557638914240.

The previous prime is 21213440024377. The next prime is 21213440024407. The reversal of 21213440024403 is 30442004431212.

It is not a de Polignac number, because 21213440024403 - 2⁹ = 21213440023891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213440024407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7474783650 + ... + 7474786487.

It is an arithmetic number, because the mean of its divisors is an integer number (1973343258216).

Almost surely, 2^{21213440024403} is an apocalyptic number.

21213440024403 is a deficient number, since it is larger than the sum of its proper divisors (10360052107053).

21213440024403 is a wasteful number, since it uses less digits than its factorization.

21213440024403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14949570194.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21213440024403 its reverse (30442004431212), we get a palindrome (51655444455615).

The spelling of 21213440024403 in words is "twenty-one trillion, two hundred thirteen billion, four hundred forty million, twenty-four thousand, four hundred three".