21112427203 has 4 divisors (see below), whose sum is σ = 24128488240. Its totient is φ = 18096366168.

The previous prime is 21112427137. The next prime is 21112427261. The reversal of 21112427203 is 30272421112.

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 21112427203 - 2¹³ = 21112419011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112427293) 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, 1508030508 + ... + 1508030521.

It is an arithmetic number, because the mean of its divisors is an integer number (6032122060).

Almost surely, 2^21112427203 is an apocalyptic number.

21112427203 is a deficient number, since it is larger than the sum of its proper divisors (3016061037).

21112427203 is an equidigital number, since it uses as much as digits as its factorization.

21112427203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016061036.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21112427203 its reverse (30272421112), we get a palindrome (51384848315).

The spelling of 21112427203 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-seven thousand, two hundred three".