23365420100021 has 2 divisors, whose sum is σ = 23365420100022. Its totient is φ = 23365420100020.

The previous prime is 23365420099993. The next prime is 23365420100053. The reversal of 23365420100021 is 12000102456332.

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., 21222375900625 + 2143044199396 = 4606775^2 + 1463914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23365420100021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23365420100081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11682710050010 + 11682710050011.

It is an arithmetic number, because the mean of its divisors is an integer number (11682710050011).

Almost surely, 2^{23365420100021} is an apocalyptic number.

It is an amenable number.

23365420100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23365420100021 is an equidigital number, since it uses as much as digits as its factorization.

23365420100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 23365420100021 its reverse (12000102456332), we get a palindrome (35365522556353).

The spelling of 23365420100021 in words is "twenty-three trillion, three hundred sixty-five billion, four hundred twenty million, one hundred thousand, twenty-one".