4278477021 has 16 divisors (see below), whose sum is σ = 7021090944. Its totient is φ = 2256778944.

The previous prime is 4278477001. The next prime is 4278477029. The reversal of 4278477021 is 1207748724.

It is not a de Polignac number, because 4278477021 - 2¹⁸ = 4278214877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278477029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7835766 + ... + 7836311.

It is an arithmetic number, because the mean of its divisors is an integer number (438818184).

Almost surely, 2^4278477021 is an apocalyptic number.

It is an amenable number.

4278477021 is a deficient number, since it is larger than the sum of its proper divisors (2742613923).

4278477021 is a wasteful number, since it uses less digits than its factorization.

4278477021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15672100.

The product of its (nonzero) digits is 175616, while the sum is 42.

The square root of 4278477021 is about 65410.0681929013. The cubic root of 4278477021 is about 1623.4156734719.

It can be divided in two parts, 42784 and 77021, that added together give a triangular number (119805 = T₄₈₉).

The spelling of 4278477021 in words is "four billion, two hundred seventy-eight million, four hundred seventy-seven thousand, twenty-one".