21101430203 has 4 divisors (see below), whose sum is σ = 24115920240. Its totient is φ = 18086940168.

The previous prime is 21101430199. The next prime is 21101430239. The reversal of 21101430203 is 30203410112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101430203 - 2² = 21101430199 is a prime.

It is a super-2 number, since 2×21101430203² (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 (21101435203) 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, 1507245008 + ... + 1507245021.

It is an arithmetic number, because the mean of its divisors is an integer number (6028980060).

Almost surely, 2^21101430203 is an apocalyptic number.

21101430203 is a deficient number, since it is larger than the sum of its proper divisors (3014490037).

21101430203 is an equidigital number, since it uses as much as digits as its factorization.

21101430203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014490036.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21101430203 its reverse (30203410112), we get a palindrome (51304840315).

The spelling of 21101430203 in words is "twenty-one billion, one hundred one million, four hundred thirty thousand, two hundred three".