21323141421 has 4 divisors (see below), whose sum is σ = 28430855232. Its totient is φ = 14215427612.

The previous prime is 21323141417. The next prime is 21323141423. The reversal of 21323141421 is 12414132312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21323141421 - 2² = 21323141417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323141391 and 21323141400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323141423) 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, 3553856901 + ... + 3553856906.

It is an arithmetic number, because the mean of its divisors is an integer number (7107713808).

Almost surely, 2^21323141421 is an apocalyptic number.

It is an amenable number.

21323141421 is a deficient number, since it is larger than the sum of its proper divisors (7107713811).

21323141421 is an equidigital number, since it uses as much as digits as its factorization.

21323141421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107713810.

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

Adding to 21323141421 its reverse (12414132312), we get a palindrome (33737273733).

The spelling of 21323141421 in words is "twenty-one billion, three hundred twenty-three million, one hundred forty-one thousand, four hundred twenty-one".