21321301323131 has 16 divisors (see below), whose sum is σ = 22973834083200. Its totient is φ = 19722148826688.

The previous prime is 21321301323079. The next prime is 21321301323167. The reversal of 21321301323131 is 13132310312312.

It is a cyclic number.

It is not a de Polignac number, because 21321301323131 - 2⁴² = 16923254812027 is a prime.

It is a super-2 number, since 2×21321301323131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21321301323131.

It is not an unprimeable number, because it can be changed into a prime (21321301323191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2551841 + ... + 7011026.

It is an arithmetic number, because the mean of its divisors is an integer number (1435864630200).

Almost surely, 2^{21321301323131} is an apocalyptic number.

21321301323131 is a deficient number, since it is larger than the sum of its proper divisors (1652532760069).

21321301323131 is a wasteful number, since it uses less digits than its factorization.

21321301323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9565658.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21321301323131 its reverse (13132310312312), we get a palindrome (34453611635443).

The spelling of 21321301323131 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred one million, three hundred twenty-three thousand, one hundred thirty-one".