221021122011 has 8 divisors (see below), whose sum is σ = 294724633104. Its totient is φ = 147332512800.

The previous prime is 221021121953. The next prime is 221021122031. The reversal of 221021122011 is 110221120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021122011 - 2²¹ = 221019024859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021122031) 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, 3690816 + ... + 3750221.

It is an arithmetic number, because the mean of its divisors is an integer number (36840579138).

Almost surely, 2^221021122011 is an apocalyptic number.

221021122011 is a deficient number, since it is larger than the sum of its proper divisors (73703511093).

221021122011 is an equidigital number, since it uses as much as digits as its factorization.

221021122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7450941.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021122011 its reverse (110221120122), we get a palindrome (331242242133).

The spelling of 221021122011 in words is "two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, eleven".