221221021101 has 32 divisors (see below), whose sum is σ = 313054887936. Its totient is φ = 138727728000.

The previous prime is 221221021069. The next prime is 221221021157. The reversal of 221221021101 is 101120122122.

It is not a de Polignac number, because 221221021101 - 2⁵ = 221221021069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221001101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 926280 + ... + 1140366.

It is an arithmetic number, because the mean of its divisors is an integer number (9782965248).

Almost surely, 2^221221021101 is an apocalyptic number.

It is an amenable number.

221221021101 is a deficient number, since it is larger than the sum of its proper divisors (91833866835).

221221021101 is a wasteful number, since it uses less digits than its factorization.

221221021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214433.

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

Adding to 221221021101 its reverse (101120122122), we get a palindrome (322341143223).

The spelling of 221221021101 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, one hundred one".