100121212111221 has 24 divisors (see below), whose sum is σ = 165753041417600. Its totient is φ = 57048189614496.

The previous prime is 100121212111213. The next prime is 100121212111223. The reversal of 100121212111221 is 122111212121001.

It is a happy number.

100121212111221 is a `hidden beast` number, since 1 + 0 + 0 + 121 + 212 + 111 + 221 = 666.

It is not a de Polignac number, because 100121212111221 - 2³ = 100121212111213 is a prime.

It is a super-2 number, since 2×100121212111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100121212111194 and 100121212111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121212111223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2276805505 + ... + 2276849478.

Almost surely, 2^{100121212111221} is an apocalyptic number.

It is an amenable number.

100121212111221 is a deficient number, since it is larger than the sum of its proper divisors (65631829306379).

100121212111221 is a wasteful number, since it uses less digits than its factorization.

100121212111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553655345 (or 4553655342 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 100121212111221 its reverse (122111212121001), we get a palindrome (222232424232222).

The spelling of 100121212111221 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-one".