21221020232303 has 2 divisors, whose sum is σ = 21221020232304. Its totient is φ = 21221020232302.

The previous prime is 21221020232297. The next prime is 21221020232327. The reversal of 21221020232303 is 30323202012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221020232303 - 2¹⁴ = 21221020215919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221020232383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510116151 + 10610510116152.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510116152).

Almost surely, 2^{21221020232303} is an apocalyptic number.

21221020232303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020232303 is an equidigital number, since it uses as much as digits as its factorization.

21221020232303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21221020232303 its reverse (30323202012212), we get a palindrome (51544222244515).

The spelling of 21221020232303 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-two thousand, three hundred three".