21421313223 has 16 divisors (see below), whose sum is σ = 28836953856. Its totient is φ = 14143351040.

The previous prime is 21421313219. The next prime is 21421313269. The reversal of 21421313223 is 32231312412.

It is a cyclic number.

It is not a de Polignac number, because 21421313223 - 2² = 21421313219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21421313193 and 21421313202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421313273) 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, 1463863 + ... + 1478423.

It is an arithmetic number, because the mean of its divisors is an integer number (1802309616).

Almost surely, 2^21421313223 is an apocalyptic number.

21421313223 is a deficient number, since it is larger than the sum of its proper divisors (7415640633).

21421313223 is a wasteful number, since it uses less digits than its factorization.

21421313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19254.

The product of its digits is 1728, while the sum is 24.

Adding to 21421313223 its reverse (32231312412), we get a palindrome (53652625635).

The spelling of 21421313223 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirteen thousand, two hundred twenty-three".