221003120021 has 8 divisors (see below), whose sum is σ = 237584542080. Its totient is φ = 204916665888.

The previous prime is 221003120011. The next prime is 221003120029. The reversal of 221003120021 is 120021300122.

It is a happy number.

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 221003120021 - 2⁶ = 221003119957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221003119978 and 221003120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221003120029) 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, 123741056 + ... + 123742841.

It is an arithmetic number, because the mean of its divisors is an integer number (29698067760).

Almost surely, 2^221003120021 is an apocalyptic number.

It is an amenable number.

221003120021 is a deficient number, since it is larger than the sum of its proper divisors (16581422059).

221003120021 is a wasteful number, since it uses less digits than its factorization.

221003120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247483963.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 221003120021 its reverse (120021300122), we get a palindrome (341024420143).

The spelling of 221003120021 in words is "two hundred twenty-one billion, three million, one hundred twenty thousand, twenty-one".