221021211101121 has 8 divisors (see below), whose sum is σ = 327438831260960. Its totient is φ = 147347474067396.

The previous prime is 221021211101027. The next prime is 221021211101167. The reversal of 221021211101121 is 121101112120122.

It is a happy number.

221021211101121 is a `hidden beast` number, since 2 + 210 + 21 + 211 + 101 + 121 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-221021211101121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021211101094 and 221021211101103.

It is not an unprimeable number, because it can be changed into a prime (221021211101221) 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, 4092985390735 + ... + 4092985390788.

It is an arithmetic number, because the mean of its divisors is an integer number (40929853907620).

Almost surely, 2^{221021211101121} is an apocalyptic number.

It is an amenable number.

221021211101121 is a deficient number, since it is larger than the sum of its proper divisors (106417620159839).

221021211101121 is an equidigital number, since it uses as much as digits as its factorization.

221021211101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185970781532 (or 8185970781526 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221021211101121 its reverse (121101112120122), we get a palindrome (342122323221243).

The spelling of 221021211101121 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, one hundred twenty-one".