4478051021 has 4 divisors (see below), whose sum is σ = 4478330844. Its totient is φ = 4477771200.

The previous prime is 4478050991. The next prime is 4478051023. The reversal of 4478051021 is 1201508744.

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 3509970025 + 968080996 = 59245^2 + 31114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4478051021 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 (4478051023) 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, 114350 + ... + 148431.

It is an arithmetic number, because the mean of its divisors is an integer number (1119582711).

Almost surely, 2^4478051021 is an apocalyptic number.

It is an amenable number.

4478051021 is a deficient number, since it is larger than the sum of its proper divisors (279823).

4478051021 is a wasteful number, since it uses less digits than its factorization.

4478051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279822.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 4478051021 is about 66918.2413172970. The cubic root of 4478051021 is about 1648.2750287456.

Adding to 4478051021 its reverse (1201508744), we get a palindrome (5679559765).

The spelling of 4478051021 in words is "four billion, four hundred seventy-eight million, fifty-one thousand, twenty-one".