4420400021 has 4 divisors (see below), whose sum is σ = 4452201600. Its totient is φ = 4388598444.

The previous prime is 4420400003. The next prime is 4420400059. The reversal of 4420400021 is 1200040244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4420400021 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 (4420400821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15900581 + ... + 15900858.

It is an arithmetic number, because the mean of its divisors is an integer number (1113050400).

Almost surely, 2^4420400021 is an apocalyptic number.

It is an amenable number.

4420400021 is a deficient number, since it is larger than the sum of its proper divisors (31801579).

4420400021 is a wasteful number, since it uses less digits than its factorization.

4420400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31801578.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 4420400021 is about 66486.0889284368. The cubic root of 4420400021 is about 1641.1710876312.

Adding to 4420400021 its reverse (1200040244), we get a palindrome (5620440265).

The spelling of 4420400021 in words is "four billion, four hundred twenty million, four hundred thousand, twenty-one".