221221100101 has 8 divisors (see below), whose sum is σ = 222834384864. Its totient is φ = 219610400880.

The previous prime is 221221100041. The next prime is 221221100141. The reversal of 221221100101 is 101001122122.

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

It is a cyclic number.

It is not a de Polignac number, because 221221100101 - 2²³ = 221212711493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221100141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474475 + ... + 817048.

It is an arithmetic number, because the mean of its divisors is an integer number (27854298108).

Almost surely, 2^221221100101 is an apocalyptic number.

It is an amenable number.

221221100101 is a deficient number, since it is larger than the sum of its proper divisors (1613284763).

221221100101 is a wasteful number, since it uses less digits than its factorization.

221221100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292771.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221221100101 its reverse (101001122122), we get a palindrome (322222222223).

The spelling of 221221100101 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred one".