21401120203 has 4 divisors (see below), whose sum is σ = 21434507928. Its totient is φ = 21367732480.

The previous prime is 21401120197. The next prime is 21401120207. The reversal of 21401120203 is 30202110412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21401120203 is a prime.

It is a super-2 number, since 2×21401120203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401120207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16692901 + ... + 16694182.

It is an arithmetic number, because the mean of its divisors is an integer number (5358626982).

Almost surely, 2^21401120203 is an apocalyptic number.

21401120203 is a deficient number, since it is larger than the sum of its proper divisors (33387725).

21401120203 is an equidigital number, since it uses as much as digits as its factorization.

21401120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33387724.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21401120203 its reverse (30202110412), we get a palindrome (51603230615).

The spelling of 21401120203 in words is "twenty-one billion, four hundred one million, one hundred twenty thousand, two hundred three".