6378090021 has 12 divisors (see below), whose sum is σ = 9408814272. Its totient is φ = 4161590376.

The previous prime is 6378089969. The next prime is 6378090023. The reversal of 6378090021 is 1200908736.

It is not a de Polignac number, because 6378090021 - 2²¹ = 6375992869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6378090023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7538691 + ... + 7539536.

It is an arithmetic number, because the mean of its divisors is an integer number (784067856).

Almost surely, 2^6378090021 is an apocalyptic number.

It is an amenable number.

6378090021 is a deficient number, since it is larger than the sum of its proper divisors (3030724251).

6378090021 is a wasteful number, since it uses less digits than its factorization.

6378090021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078280 (or 15078277 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 6378090021 is about 79862.9452311897. The cubic root of 6378090021 is about 1854.5144212322.

Adding to 6378090021 its reverse (1200908736), we get a palindrome (7578998757).

The spelling of 6378090021 in words is "six billion, three hundred seventy-eight million, ninety thousand, twenty-one".