21001320321130 has 16 divisors (see below), whose sum is σ = 37971893965824. Its totient is φ = 8362857597840.

The previous prime is 21001320321103. The next prime is 21001320321197. The reversal of 21001320321130 is 3112302310012.

It is a junction number, because it is equal to n+sod(n) for n = 21001320321098 and 21001320321107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4708813986 + ... + 4708818445.

It is an arithmetic number, because the mean of its divisors is an integer number (2373243372864).

Almost surely, 2^{21001320321130} is an apocalyptic number.

21001320321130 is a deficient number, since it is larger than the sum of its proper divisors (16970573644694).

21001320321130 is a wasteful number, since it uses less digits than its factorization.

21001320321130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9417632661.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001320321130 its reverse (3112302310012), we get a palindrome (24113622631142).

The spelling of 21001320321130 in words is "twenty-one trillion, one billion, three hundred twenty million, three hundred twenty-one thousand, one hundred thirty".