21121330303 has 2 divisors, whose sum is σ = 21121330304. Its totient is φ = 21121330302.

The previous prime is 21121330267. The next prime is 21121330309. The reversal of 21121330303 is 30303312112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121330303 - 2¹³ = 21121322111 is a prime.

It is a super-2 number, since 2×21121330303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121330309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560665151 + 10560665152.

It is an arithmetic number, because the mean of its divisors is an integer number (10560665152).

Almost surely, 2^21121330303 is an apocalyptic number.

21121330303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121330303 is an equidigital number, since it uses as much as digits as its factorization.

21121330303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21121330303 its reverse (30303312112), we get a palindrome (51424642415).

The spelling of 21121330303 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty thousand, three hundred three".