21226020203 has 2 divisors, whose sum is σ = 21226020204. Its totient is φ = 21226020202.

The previous prime is 21226020187. The next prime is 21226020209. The reversal of 21226020203 is 30202062212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21226020203 - 2⁴ = 21226020187 is a prime.

It is a super-2 number, since 2×21226020203² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21226020209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613010101 + 10613010102.

It is an arithmetic number, because the mean of its divisors is an integer number (10613010102).

Almost surely, 2^21226020203 is an apocalyptic number.

21226020203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226020203 is an equidigital number, since it uses as much as digits as its factorization.

21226020203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21226020203 its reverse (30202062212), we get a palindrome (51428082415).

The spelling of 21226020203 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, two hundred three".