21121331303 has 2 divisors, whose sum is σ = 21121331304. Its totient is φ = 21121331302.

The previous prime is 21121331263. The next prime is 21121331321. The reversal of 21121331303 is 30313312112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121331303 - 2¹⁴ = 21121314919 is a prime.

It is a super-2 number, since 2×21121331303² (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 (21121331333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560665651 + 10560665652.

It is an arithmetic number, because the mean of its divisors is an integer number (10560665652).

Almost surely, 2^21121331303 is an apocalyptic number.

21121331303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121331303 is an equidigital number, since it uses as much as digits as its factorization.

21121331303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21121331303 its reverse (30313312112), we get a palindrome (51434643415).

The spelling of 21121331303 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred three".