21223203047 has 2 divisors, whose sum is σ = 21223203048. Its totient is φ = 21223203046.

The previous prime is 21223203013. The next prime is 21223203083. The reversal of 21223203047 is 74030232212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223203047 - 2⁶ = 21223202983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223203097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611601523 + 10611601524.

It is an arithmetic number, because the mean of its divisors is an integer number (10611601524).

Almost surely, 2^21223203047 is an apocalyptic number.

21223203047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223203047 is an equidigital number, since it uses as much as digits as its factorization.

21223203047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

Adding to 21223203047 its reverse (74030232212), we get a palindrome (95253435259).

The spelling of 21223203047 in words is "twenty-one billion, two hundred twenty-three million, two hundred three thousand, forty-seven".