21421203323 has 16 divisors (see below), whose sum is σ = 23305328256. Its totient is φ = 19571328000.

The previous prime is 21421203299. The next prime is 21421203359. The reversal of 21421203323 is 32330212412.

It is a cyclic number.

It is not a de Polignac number, because 21421203323 - 2²⁰ = 21420154747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421203623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1093511 + ... + 1112927.

It is an arithmetic number, because the mean of its divisors is an integer number (1456583016).

Almost surely, 2^21421203323 is an apocalyptic number.

21421203323 is a deficient number, since it is larger than the sum of its proper divisors (1884124933).

21421203323 is a wasteful number, since it uses less digits than its factorization.

21421203323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20294.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21421203323 its reverse (32330212412), we get a palindrome (53751415735).

The spelling of 21421203323 in words is "twenty-one billion, four hundred twenty-one million, two hundred three thousand, three hundred twenty-three".