21213545032423 has 2 divisors, whose sum is σ = 21213545032424. Its totient is φ = 21213545032422.

The previous prime is 21213545032399. The next prime is 21213545032483. The reversal of 21213545032423 is 32423054531212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213545032423 - 2⁵ = 21213545032391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213545032483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606772516211 + 10606772516212.

It is an arithmetic number, because the mean of its divisors is an integer number (10606772516212).

Almost surely, 2^{21213545032423} is an apocalyptic number.

21213545032423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213545032423 is an equidigital number, since it uses as much as digits as its factorization.

21213545032423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21213545032423 its reverse (32423054531212), we get a palindrome (53636599563635).

The spelling of 21213545032423 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-five million, thirty-two thousand, four hundred twenty-three".