21323012401221 has 16 divisors (see below), whose sum is σ = 28492082424000. Its totient is φ = 14184643102208.

The previous prime is 21323012401211. The next prime is 21323012401277. The reversal of 21323012401221 is 12210421032312.

It is a cyclic number.

It is not a de Polignac number, because 21323012401221 - 2¹⁰ = 21323012400197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323012401191 and 21323012401200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323012401211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 105182485 + ... + 105385013.

It is an arithmetic number, because the mean of its divisors is an integer number (1780755151500).

Almost surely, 2^{21323012401221} is an apocalyptic number.

It is an amenable number.

21323012401221 is a deficient number, since it is larger than the sum of its proper divisors (7169070022779).

21323012401221 is a wasteful number, since it uses less digits than its factorization.

21323012401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278148.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21323012401221 its reverse (12210421032312), we get a palindrome (33533433433533).

The spelling of 21323012401221 in words is "twenty-one trillion, three hundred twenty-three billion, twelve million, four hundred one thousand, two hundred twenty-one".