21403214323 has 4 divisors (see below), whose sum is σ = 21405257640. Its totient is φ = 21401171008.

The previous prime is 21403214311. The next prime is 21403214347. The reversal of 21403214323 is 32341230412.

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 21403214323 - 2²⁹ = 20866343411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21403214303) 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, 1005865 + ... + 1026922.

It is an arithmetic number, because the mean of its divisors is an integer number (5351314410).

Almost surely, 2^21403214323 is an apocalyptic number.

21403214323 is a deficient number, since it is larger than the sum of its proper divisors (2043317).

21403214323 is a wasteful number, since it uses less digits than its factorization.

21403214323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043316.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21403214323 its reverse (32341230412), we get a palindrome (53744444735).

The spelling of 21403214323 in words is "twenty-one billion, four hundred three million, two hundred fourteen thousand, three hundred twenty-three".