21421211203 has 32 divisors (see below), whose sum is σ = 25461596160. Its totient is φ = 17635380480.

The previous prime is 21421211179. The next prime is 21421211237. The reversal of 21421211203 is 30211212412.

It is a cyclic number.

It is not a de Polignac number, because 21421211203 - 2⁹ = 21421210691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21421211003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24995151 + ... + 24996007.

It is an arithmetic number, because the mean of its divisors is an integer number (795674880).

Almost surely, 2^21421211203 is an apocalyptic number.

21421211203 is a deficient number, since it is larger than the sum of its proper divisors (4040384957).

21421211203 is a wasteful number, since it uses less digits than its factorization.

21421211203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21421211203 its reverse (30211212412), we get a palindrome (51632423615).

The spelling of 21421211203 in words is "twenty-one billion, four hundred twenty-one million, two hundred eleven thousand, two hundred three".