21525223123 has 2 divisors, whose sum is σ = 21525223124. Its totient is φ = 21525223122.

The previous prime is 21525223087. The next prime is 21525223133. The reversal of 21525223123 is 32132252512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21525223123 - 2⁹ = 21525222611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21525223091 and 21525223100.

It is not a weakly prime, because it can be changed into another prime (21525223133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762611561 + 10762611562.

It is an arithmetic number, because the mean of its divisors is an integer number (10762611562).

Almost surely, 2^21525223123 is an apocalyptic number.

21525223123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525223123 is an equidigital number, since it uses as much as digits as its factorization.

21525223123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 28.

Adding to 21525223123 its reverse (32132252512), we get a palindrome (53657475635).

The spelling of 21525223123 in words is "twenty-one billion, five hundred twenty-five million, two hundred twenty-three thousand, one hundred twenty-three".