23533530523721 has 2 divisors, whose sum is σ = 23533530523722. Its totient is φ = 23533530523720.

The previous prime is 23533530523709. The next prime is 23533530523751. The reversal of 23533530523721 is 12732503533532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13808737752121 + 9724792771600 = 3716011^2 + 3118460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23533530523721 is a prime.

It is not a weakly prime, because it can be changed into another prime (23533530523751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11766765261860 + 11766765261861.

It is an arithmetic number, because the mean of its divisors is an integer number (11766765261861).

Almost surely, 2^{23533530523721} is an apocalyptic number.

It is an amenable number.

23533530523721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23533530523721 is an equidigital number, since it uses as much as digits as its factorization.

23533530523721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701000, while the sum is 44.

The spelling of 23533530523721 in words is "twenty-three trillion, five hundred thirty-three billion, five hundred thirty million, five hundred twenty-three thousand, seven hundred twenty-one".