100011212221221 has 12 divisors (see below), whose sum is σ = 165097874143072. Its totient is φ = 57149264126376.

The previous prime is 100011212221201. The next prime is 100011212221241. The reversal of 100011212221221 is 122122212110001.

100011212221221 is a `hidden beast` number, since 1 + 0 + 0 + 0 + 11 + 212 + 221 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (100011212221201) and next prime (100011212221241).

It is not a de Polignac number, because 100011212221221 - 2⁴⁵ = 64826840132389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100011212221194 and 100011212221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100011212221201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793739779471 + ... + 793739779596.

Almost surely, 2^{100011212221221} is an apocalyptic number.

It is an amenable number.

100011212221221 is a deficient number, since it is larger than the sum of its proper divisors (65086661921851).

100011212221221 is a wasteful number, since it uses less digits than its factorization.

100011212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587479559080 (or 1587479559077 counting only the distinct ones).

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

Adding to 100011212221221 its reverse (122122212110001), we get a palindrome (222133424331222).

The spelling of 100011212221221 in words is "one hundred trillion, eleven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".