21421311203 has 2 divisors, whose sum is σ = 21421311204. Its totient is φ = 21421311202.

The previous prime is 21421311173. The next prime is 21421311229. The reversal of 21421311203 is 30211312412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21421311203 - 2⁶ = 21421311139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21421311103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710655601 + 10710655602.

It is an arithmetic number, because the mean of its divisors is an integer number (10710655602).

Almost surely, 2^21421311203 is an apocalyptic number.

21421311203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421311203 is an equidigital number, since it uses as much as digits as its factorization.

21421311203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21421311203 its reverse (30211312412), we get a palindrome (51632623615).

The spelling of 21421311203 in words is "twenty-one billion, four hundred twenty-one million, three hundred eleven thousand, two hundred three".