38707851421 has 2 divisors, whose sum is σ = 38707851422. Its totient is φ = 38707851420.

The previous prime is 38707851419. The next prime is 38707851467. The reversal of 38707851421 is 12415870783.

It is an a-pointer prime, because the next prime (38707851467) can be obtained adding 38707851421 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30246427225 + 8461424196 = 173915^2 + 91986^2 .

It is a cyclic number.

It is not a de Polignac number, because 38707851421 - 2¹ = 38707851419 is a prime.

Together with 38707851419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38707851491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19353925710 + 19353925711.

It is an arithmetic number, because the mean of its divisors is an integer number (19353925711).

Almost surely, 2^38707851421 is an apocalyptic number.

It is an amenable number.

38707851421 is a deficient number, since it is larger than the sum of its proper divisors (1).

38707851421 is an equidigital number, since it uses as much as digits as its factorization.

38707851421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 38707851421 in words is "thirty-eight billion, seven hundred seven million, eight hundred fifty-one thousand, four hundred twenty-one".