21124220223403 has 16 divisors (see below), whose sum is σ = 23305256085600. Its totient is φ = 18986658324480.

The previous prime is 21124220223383. The next prime is 21124220223409. The reversal of 21124220223403 is 30432202242112.

It is not a de Polignac number, because 21124220223403 - 2³⁷ = 20986781269931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124220223409) 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, 12555343 + ... + 14138071.

It is an arithmetic number, because the mean of its divisors is an integer number (1456578505350).

Almost surely, 2^{21124220223403} is an apocalyptic number.

21124220223403 is a deficient number, since it is larger than the sum of its proper divisors (2181035862197).

21124220223403 is a wasteful number, since it uses less digits than its factorization.

21124220223403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596462.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21124220223403 its reverse (30432202242112), we get a palindrome (51556422465515).

The spelling of 21124220223403 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred twenty million, two hundred twenty-three thousand, four hundred three".