21312211032321 has 32 divisors (see below), whose sum is σ = 31027295918592. Its totient is φ = 12904948143360.

The previous prime is 21312211032289. The next prime is 21312211032383. The reversal of 21312211032321 is 12323011221312.

It is not a de Polignac number, because 21312211032321 - 2⁵ = 21312211032289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312211032291 and 21312211032300.

It is not an unprimeable number, because it can be changed into a prime (21312211032221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175662346 + ... + 175783628.

It is an arithmetic number, because the mean of its divisors is an integer number (969602997456).

Almost surely, 2^{21312211032321} is an apocalyptic number.

It is an amenable number.

21312211032321 is a deficient number, since it is larger than the sum of its proper divisors (9715084886271).

21312211032321 is a wasteful number, since it uses less digits than its factorization.

21312211032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126013.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21312211032321 its reverse (12323011221312), we get a palindrome (33635222253633).

The spelling of 21312211032321 in words is "twenty-one trillion, three hundred twelve billion, two hundred eleven million, thirty-two thousand, three hundred twenty-one".