221012221210101 has 6 divisors (see below), whose sum is σ = 319239875081270. Its totient is φ = 147341480806728.

The previous prime is 221012221210073. The next prime is 221012221210127. The reversal of 221012221210101 is 101012122210122.

221012221210101 is a `hidden beast` number, since 2 + 210 + 12 + 221 + 210 + 10 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 220994090856900 + 18130353201 = 14865870^2 + 134649^2 .

It is not a de Polignac number, because 221012221210101 - 2¹⁵ = 221012221177333 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 (221012221211101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12278456733886 + ... + 12278456733903.

Almost surely, 2^{221012221210101} is an apocalyptic number.

It is an amenable number.

221012221210101 is a deficient number, since it is larger than the sum of its proper divisors (98227653871169).

221012221210101 is a wasteful number, since it uses less digits than its factorization.

221012221210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24556913467795 (or 24556913467792 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221012221210101 its reverse (101012122210122), we get a palindrome (322024343420223).

The spelling of 221012221210101 in words is "two hundred twenty-one trillion, twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".