138421564399 has 2 divisors, whose sum is σ = 138421564400. Its totient is φ = 138421564398.

The previous prime is 138421564387. The next prime is 138421564409. The reversal of 138421564399 is 993465124831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138421564399 - 2⁹ = 138421563887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138421564199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69210782199 + 69210782200.

It is an arithmetic number, because the mean of its divisors is an integer number (69210782200).

Almost surely, 2^138421564399 is an apocalyptic number.

138421564399 is a deficient number, since it is larger than the sum of its proper divisors (1).

138421564399 is an equidigital number, since it uses as much as digits as its factorization.

138421564399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The spelling of 138421564399 in words is "one hundred thirty-eight billion, four hundred twenty-one million, five hundred sixty-four thousand, three hundred ninety-nine".