21313433423 has 2 divisors, whose sum is σ = 21313433424. Its totient is φ = 21313433422.

The previous prime is 21313433411. The next prime is 21313433467. The reversal of 21313433423 is 32433431312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313433423 - 2¹⁴ = 21313417039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313333423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656716711 + 10656716712.

It is an arithmetic number, because the mean of its divisors is an integer number (10656716712).

Almost surely, 2^21313433423 is an apocalyptic number.

21313433423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313433423 is an equidigital number, since it uses as much as digits as its factorization.

21313433423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 29.

Adding to 21313433423 its reverse (32433431312), we get a palindrome (53746864735).

The spelling of 21313433423 in words is "twenty-one billion, three hundred thirteen million, four hundred thirty-three thousand, four hundred twenty-three".