221020022122121 has 16 divisors (see below), whose sum is σ = 227540206833408. Its totient is φ = 214555679625600.

The previous prime is 221020022122103. The next prime is 221020022122169. The reversal of 221020022122121 is 121221220020122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020022122121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020022122093 and 221020022122102.

It is not an unprimeable number, because it can be changed into a prime (221020022122421) 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, 4277951 + ... + 21455556.

It is an arithmetic number, because the mean of its divisors is an integer number (14221262927088).

Almost surely, 2^{221020022122121} is an apocalyptic number.

It is an amenable number.

221020022122121 is a deficient number, since it is larger than the sum of its proper divisors (6520184711287).

221020022122121 is a wasteful number, since it uses less digits than its factorization.

221020022122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25734592.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221020022122121 its reverse (121221220020122), we get a palindrome (342241242142243).

The spelling of 221020022122121 in words is "two hundred twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".