21013312303221 has 24 divisors (see below), whose sum is σ = 33126372571104. Its totient is φ = 11810761008480.

The previous prime is 21013312303211. The next prime is 21013312303223. The reversal of 21013312303221 is 12230321331012.

It is not a de Polignac number, because 21013312303221 - 2¹¹ = 21013312301173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21013312303191 and 21013312303200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013312303223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1171693515 + ... + 1171711448.

It is an arithmetic number, because the mean of its divisors is an integer number (1380265523796).

Almost surely, 2^{21013312303221} is an apocalyptic number.

21013312303221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21013312303221 is a deficient number, since it is larger than the sum of its proper divisors (12113060267883).

21013312303221 is a wasteful number, since it uses less digits than its factorization.

21013312303221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343405041 (or 2343405034 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21013312303221 its reverse (12230321331012), we get a palindrome (33243633634233).

The spelling of 21013312303221 in words is "twenty-one trillion, thirteen billion, three hundred twelve million, three hundred three thousand, two hundred twenty-one".