221440430021 has 8 divisors (see below), whose sum is σ = 222970548864. Its totient is φ = 219914845920.

The previous prime is 221440429979. The next prime is 221440430023. The reversal of 221440430021 is 120034044122.

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 221440430021 - 2⁶ = 221440429957 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 (221440430023) 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, 1035656 + ... + 1231041.

It is an arithmetic number, because the mean of its divisors is an integer number (27871318608).

Almost surely, 2^221440430021 is an apocalyptic number.

It is an amenable number.

221440430021 is a deficient number, since it is larger than the sum of its proper divisors (1530118843).

221440430021 is a wasteful number, since it uses less digits than its factorization.

221440430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267371.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221440430021 its reverse (120034044122), we get a palindrome (341474474143).

The spelling of 221440430021 in words is "two hundred twenty-one billion, four hundred forty million, four hundred thirty thousand, twenty-one".