21032120423 has 2 divisors, whose sum is σ = 21032120424. Its totient is φ = 21032120422.

The previous prime is 21032120413. The next prime is 21032120443. The reversal of 21032120423 is 32402123012.

It is an a-pointer prime, because the next prime (21032120443) can be obtained adding 21032120423 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21032120423 - 2¹⁰ = 21032119399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21032120395 and 21032120404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21032120413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516060211 + 10516060212.

It is an arithmetic number, because the mean of its divisors is an integer number (10516060212).

Almost surely, 2^21032120423 is an apocalyptic number.

21032120423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032120423 is an equidigital number, since it uses as much as digits as its factorization.

21032120423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21032120423 its reverse (32402123012), we get a palindrome (53434243435).

The spelling of 21032120423 in words is "twenty-one billion, thirty-two million, one hundred twenty thousand, four hundred twenty-three".