4420401021 has 6 divisors (see below), whose sum is σ = 6385023710. Its totient is φ = 2946934008.

The previous prime is 4420401017. The next prime is 4420401059. The reversal of 4420401021 is 1201040244.

It can be written as a sum of positive squares in only one way, i.e., 2925728100 + 1494672921 = 54090^2 + 38661^2 .

It is not a de Polignac number, because 4420401021 - 2² = 4420401017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4420400985 and 4420401003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4420401001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 245577826 + ... + 245577843.

Almost surely, 2^4420401021 is an apocalyptic number.

It is an amenable number.

4420401021 is a deficient number, since it is larger than the sum of its proper divisors (1964622689).

4420401021 is a wasteful number, since it uses less digits than its factorization.

4420401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491155675 (or 491155672 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 4420401021 is about 66486.0964488065. The cubic root of 4420401021 is about 1641.1712113885.

Adding to 4420401021 its reverse (1201040244), we get a palindrome (5621441265).

The spelling of 4420401021 in words is "four billion, four hundred twenty million, four hundred one thousand, twenty-one".