38924655821 has 2 divisors, whose sum is σ = 38924655822. Its totient is φ = 38924655820.

The previous prime is 38924655673. The next prime is 38924655823. The reversal of 38924655821 is 12855642983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38343122596 + 581533225 = 195814^2 + 24115^2 .

It is an emirp because it is prime and its reverse (12855642983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38924655821 is a prime.

Together with 38924655823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38924655823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19462327910 + 19462327911.

It is an arithmetic number, because the mean of its divisors is an integer number (19462327911).

Almost surely, 2^38924655821 is an apocalyptic number.

It is an amenable number.

38924655821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38924655821 is an equidigital number, since it uses as much as digits as its factorization.

38924655821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4147200, while the sum is 53.

The spelling of 38924655821 in words is "thirty-eight billion, nine hundred twenty-four million, six hundred fifty-five thousand, eight hundred twenty-one".