102440343420421 has 2 divisors, whose sum is σ = 102440343420422. Its totient is φ = 102440343420420.

The previous prime is 102440343420403. The next prime is 102440343420427. The reversal of 102440343420421 is 124024343044201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94706860745025 + 7733482675396 = 9731745^2 + 2780914^2 .

It is an emirp because it is prime and its reverse (124024343044201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102440343420421 - 2¹³ = 102440343412229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102440343420427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51220171710210 + 51220171710211.

It is an arithmetic number, because the mean of its divisors is an integer number (51220171710211).

Almost surely, 2^{102440343420421} is an apocalyptic number.

It is an amenable number.

102440343420421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102440343420421 is an equidigital number, since it uses as much as digits as its factorization.

102440343420421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 102440343420421 its reverse (124024343044201), we get a palindrome (226464686464622).

The spelling of 102440343420421 in words is "one hundred two trillion, four hundred forty billion, three hundred forty-three million, four hundred twenty thousand, four hundred twenty-one".