221120212002021 has 6 divisors (see below), whose sum is σ = 319395861780710. Its totient is φ = 147413474668008.

The previous prime is 221120212001987. The next prime is 221120212002047. The reversal of 221120212002021 is 120200212021122.

It is a happy number.

221120212002021 is a `hidden beast` number, since 221 + 1 + 20 + 21 + 200 + 202 + 1 = 666.

221120212002021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 193265186940225 + 27855025061796 = 13901985^2 + 5277786^2 .

It is not a de Polignac number, because 221120212002021 - 2¹⁸ = 221120211739877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221120212001985 and 221120212002003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120212002721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12284456222326 + ... + 12284456222343.

Almost surely, 2^{221120212002021} is an apocalyptic number.

It is an amenable number.

221120212002021 is a deficient number, since it is larger than the sum of its proper divisors (98275649778689).

221120212002021 is a wasteful number, since it uses less digits than its factorization.

221120212002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24568912444675 (or 24568912444672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221120212002021 its reverse (120200212021122), we get a palindrome (341320424023143).

The spelling of 221120212002021 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twelve million, two thousand, twenty-one".