23145102821 has 2 divisors, whose sum is σ = 23145102822. Its totient is φ = 23145102820.

The previous prime is 23145102793. The next prime is 23145102857. The reversal of 23145102821 is 12820154132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20367285796 + 2777817025 = 142714^2 + 52705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23145102821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23145102521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11572551410 + 11572551411.

It is an arithmetic number, because the mean of its divisors is an integer number (11572551411).

Almost surely, 2^23145102821 is an apocalyptic number.

It is an amenable number.

23145102821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23145102821 is an equidigital number, since it uses as much as digits as its factorization.

23145102821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 23145102821 its reverse (12820154132), we get a palindrome (35965256953).

The spelling of 23145102821 in words is "twenty-three billion, one hundred forty-five million, one hundred two thousand, eight hundred twenty-one".