2678292078421 has 4 divisors (see below), whose sum is σ = 2679068623500. Its totient is φ = 2677515533344.

The previous prime is 2678292078419. The next prime is 2678292078431. The reversal of 2678292078421 is 1248702928762.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414621375921 + 2263670702500 = 643911^2 + 1504550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2678292078421 - 2¹ = 2678292078419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678292078401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388267366 + ... + 388274263.

It is an arithmetic number, because the mean of its divisors is an integer number (669767155875).

Almost surely, 2^{2678292078421} is an apocalyptic number.

It is an amenable number.

2678292078421 is a deficient number, since it is larger than the sum of its proper divisors (776545079).

2678292078421 is an equidigital number, since it uses as much as digits as its factorization.

2678292078421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776545078.

The product of its (nonzero) digits is 10838016, while the sum is 58.

The spelling of 2678292078421 in words is "two trillion, six hundred seventy-eight billion, two hundred ninety-two million, seventy-eight thousand, four hundred twenty-one".