38618621548421 has 2 divisors, whose sum is σ = 38618621548422. Its totient is φ = 38618621548420.

The previous prime is 38618621548319. The next prime is 38618621548541. The reversal of 38618621548421 is 12484512681683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20437044940225 + 18181576608196 = 4520735^2 + 4263986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38618621548421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38618621541421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19309310774210 + 19309310774211.

It is an arithmetic number, because the mean of its divisors is an integer number (19309310774211).

Almost surely, 2^{38618621548421} is an apocalyptic number.

It is an amenable number.

38618621548421 is a deficient number, since it is larger than the sum of its proper divisors (1).

38618621548421 is an equidigital number, since it uses as much as digits as its factorization.

38618621548421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17694720, while the sum is 59.

The spelling of 38618621548421 in words is "thirty-eight trillion, six hundred eighteen billion, six hundred twenty-one million, five hundred forty-eight thousand, four hundred twenty-one".