23212073557 has 2 divisors, whose sum is σ = 23212073558. Its totient is φ = 23212073556.

The previous prime is 23212073477. The next prime is 23212073567. The reversal of 23212073557 is 75537021232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19475318916 + 3736754641 = 139554^2 + 61129^2 .

It is a cyclic number.

It is not a de Polignac number, because 23212073557 - 2⁷ = 23212073429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212073567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606036778 + 11606036779.

It is an arithmetic number, because the mean of its divisors is an integer number (11606036779).

Almost surely, 2^23212073557 is an apocalyptic number.

It is an amenable number.

23212073557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212073557 is an equidigital number, since it uses as much as digits as its factorization.

23212073557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88200, while the sum is 37.

Adding to 23212073557 its reverse (75537021232), we get a palindrome (98749094789).

The spelling of 23212073557 in words is "twenty-three billion, two hundred twelve million, seventy-three thousand, five hundred fifty-seven".