21221301323 has 4 divisors (see below), whose sum is σ = 21221786808. Its totient is φ = 21220815840.

The previous prime is 21221301301. The next prime is 21221301341. The reversal of 21221301323 is 32310312212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221301323 - 2⁸ = 21221301067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221301295 and 21221301304.

It is not an unprimeable number, because it can be changed into a prime (21221301523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169886 + ... + 267027.

It is an arithmetic number, because the mean of its divisors is an integer number (5305446702).

Almost surely, 2^21221301323 is an apocalyptic number.

21221301323 is a deficient number, since it is larger than the sum of its proper divisors (485485).

21221301323 is an equidigital number, since it uses as much as digits as its factorization.

21221301323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485484.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21221301323 its reverse (32310312212), we get a palindrome (53531613535).

The spelling of 21221301323 in words is "twenty-one billion, two hundred twenty-one million, three hundred one thousand, three hundred twenty-three".