21012232203 has 48 divisors (see below), whose sum is σ = 32988058272. Its totient is φ = 12839040000.

The previous prime is 21012232177. The next prime is 21012232207. The reversal of 21012232203 is 30223221012.

It is not a de Polignac number, because 21012232203 - 2²⁸ = 20743796747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012232207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 931488 + ... + 953778.

It is an arithmetic number, because the mean of its divisors is an integer number (687251214).

Almost surely, 2^21012232203 is an apocalyptic number.

21012232203 is a deficient number, since it is larger than the sum of its proper divisors (11975826069).

21012232203 is a wasteful number, since it uses less digits than its factorization.

21012232203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22476 (or 22473 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21012232203 its reverse (30223221012), we get a palindrome (51235453215).

The spelling of 21012232203 in words is "twenty-one billion, twelve million, two hundred thirty-two thousand, two hundred three".