4278146021 has 2 divisors, whose sum is σ = 4278146022. Its totient is φ = 4278146020.

The previous prime is 4278146017. The next prime is 4278146029. The reversal of 4278146021 is 1206418724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3710515396 + 567630625 = 60914^2 + 23825^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278146021 - 2² = 4278146017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4278146029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139073010 + 2139073011.

It is an arithmetic number, because the mean of its divisors is an integer number (2139073011).

Almost surely, 2^4278146021 is an apocalyptic number.

It is an amenable number.

4278146021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278146021 is an equidigital number, since it uses as much as digits as its factorization.

4278146021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 4278146021 is about 65407.5379524409. The cubic root of 4278146021 is about 1623.3738077611.

The spelling of 4278146021 in words is "four billion, two hundred seventy-eight million, one hundred forty-six thousand, twenty-one".