8865215383421 has 2 divisors, whose sum is σ = 8865215383422. Its totient is φ = 8865215383420.

The previous prime is 8865215383303. The next prime is 8865215383439. The reversal of 8865215383421 is 1243835125688.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5643499116025 + 3221716267396 = 2375605^2 + 1794914^2 .

It is a cyclic number.

It is not a de Polignac number, because 8865215383421 - 2¹⁴ = 8865215367037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8865215383121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4432607691710 + 4432607691711.

It is an arithmetic number, because the mean of its divisors is an integer number (4432607691711).

Almost surely, 2^{8865215383421} is an apocalyptic number.

It is an amenable number.

8865215383421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8865215383421 is an equidigital number, since it uses as much as digits as its factorization.

8865215383421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11059200, while the sum is 56.

The spelling of 8865215383421 in words is "eight trillion, eight hundred sixty-five billion, two hundred fifteen million, three hundred eighty-three thousand, four hundred twenty-one".