4451420021 has 8 divisors (see below), whose sum is σ = 4536514080. Its totient is φ = 4366366992.

The previous prime is 4451420009. The next prime is 4451420041. The reversal of 4451420021 is 1200241544.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4451420021 - 2¹⁴ = 4451403637 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 (4451420041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293810 + ... + 308588.

It is an arithmetic number, because the mean of its divisors is an integer number (567064260).

Almost surely, 2^4451420021 is an apocalyptic number.

It is an amenable number.

4451420021 is a deficient number, since it is larger than the sum of its proper divisors (85094059).

4451420021 is a wasteful number, since it uses less digits than its factorization.

4451420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20515.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 4451420021 is about 66718.9629790512. The cubic root of 4451420021 is about 1645.0010958256.

Adding to 4451420021 its reverse (1200241544), we get a palindrome (5651661565).

The spelling of 4451420021 in words is "four billion, four hundred fifty-one million, four hundred twenty thousand, twenty-one".