221440400021 has 8 divisors (see below), whose sum is σ = 225218448000. Its totient is φ = 217663179520.

The previous prime is 221440400009. The next prime is 221440400029. The reversal of 221440400021 is 120004044122.

221440400021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221440400021 is a prime.

It is a super-2 number, since 2×221440400021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221440399966 and 221440400002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221440400029) 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 7 ways as a sum of consecutive naturals, for example, 345380 + ... + 749778.

It is an arithmetic number, because the mean of its divisors is an integer number (28152306000).

Almost surely, 2^221440400021 is an apocalyptic number.

It is an amenable number.

221440400021 is a deficient number, since it is larger than the sum of its proper divisors (3778047979).

221440400021 is an equidigital number, since it uses as much as digits as its factorization.

221440400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413739.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221440400021 its reverse (120004044122), we get a palindrome (341444444143).

The spelling of 221440400021 in words is "two hundred twenty-one billion, four hundred forty million, four hundred thousand, twenty-one".