3807138558221 has 2 divisors, whose sum is σ = 3807138558222. Its totient is φ = 3807138558220.

The previous prime is 3807138558217. The next prime is 3807138558241. The reversal of 3807138558221 is 1228558317083.

It is a happy number.

3807138558221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3806943397321 + 195160900 = 1951139^2 + 13970^2 .

It is a cyclic number.

It is not a de Polignac number, because 3807138558221 - 2² = 3807138558217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3807138558241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1903569279110 + 1903569279111.

It is an arithmetic number, because the mean of its divisors is an integer number (1903569279111).

Almost surely, 2^{3807138558221} is an apocalyptic number.

It is an amenable number.

3807138558221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3807138558221 is an equidigital number, since it uses as much as digits as its factorization.

3807138558221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 3807138558221 in words is "three trillion, eight hundred seven billion, one hundred thirty-eight million, five hundred fifty-eight thousand, two hundred twenty-one".