221120220100021 has 16 divisors (see below), whose sum is σ = 246508704195840. Its totient is φ = 196618199964480.

The previous prime is 221120220100019. The next prime is 221120220100033. The reversal of 221120220100021 is 120001022021122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221120220100021 - 2¹ = 221120220100019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221120220099968 and 221120220100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120220100621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133081266 + ... + 134732563.

It is an arithmetic number, because the mean of its divisors is an integer number (15406794012240).

Almost surely, 2^{221120220100021} is an apocalyptic number.

It is an amenable number.

221120220100021 is a deficient number, since it is larger than the sum of its proper divisors (25388484095819).

221120220100021 is a wasteful number, since it uses less digits than its factorization.

221120220100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267815484.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221120220100021 its reverse (120001022021122), we get a palindrome (341121242121143).

The spelling of 221120220100021 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred thousand, twenty-one".