21213442523123 has 2 divisors, whose sum is σ = 21213442523124. Its totient is φ = 21213442523122.

The previous prime is 21213442523113. The next prime is 21213442523227. The reversal of 21213442523123 is 32132524431212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213442523123 - 2¹⁸ = 21213442260979 is a prime.

It is a super-2 number, since 2×21213442523123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21213442523113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606721261561 + 10606721261562.

It is an arithmetic number, because the mean of its divisors is an integer number (10606721261562).

Almost surely, 2^{21213442523123} is an apocalyptic number.

21213442523123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213442523123 is an equidigital number, since it uses as much as digits as its factorization.

21213442523123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 35.

Adding to 21213442523123 its reverse (32132524431212), we get a palindrome (53345966954335).

The spelling of 21213442523123 in words is "twenty-one trillion, two hundred thirteen billion, four hundred forty-two million, five hundred twenty-three thousand, one hundred twenty-three".