21012231203 has 4 divisors (see below), whose sum is σ = 21459300000. Its totient is φ = 20565162408.

The previous prime is 21012231161. The next prime is 21012231211. The reversal of 21012231203 is 30213221012.

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 21012231203 - 2¹² = 21012227107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012231283) 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, 223534328 + ... + 223534421.

It is an arithmetic number, because the mean of its divisors is an integer number (5364825000).

Almost surely, 2^21012231203 is an apocalyptic number.

21012231203 is a deficient number, since it is larger than the sum of its proper divisors (447068797).

21012231203 is an equidigital number, since it uses as much as digits as its factorization.

21012231203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447068796.

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

Adding to 21012231203 its reverse (30213221012), we get a palindrome (51225452215).

The spelling of 21012231203 in words is "twenty-one billion, twelve million, two hundred thirty-one thousand, two hundred three".