100001010121221 has 12 divisors (see below), whose sum is σ = 146557954227776. Its totient is φ = 60606672800520.

The previous prime is 100001010121189. The next prime is 100001010121339. The reversal of 100001010121221 is 122121010100001.

It is not a de Polignac number, because 100001010121221 - 2⁵ = 100001010121189 is a prime.

It is a super-2 number, since 2×100001010121221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001010121197 and 100001010121206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001010121121) 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, 137742437821 + ... + 137742438546.

Almost surely, 2^{100001010121221} is an apocalyptic number.

100001010121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100001010121221 is a deficient number, since it is larger than the sum of its proper divisors (46556944106555).

100001010121221 is a wasteful number, since it uses less digits than its factorization.

100001010121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275484876392 (or 275484876381 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 100001010121221 its reverse (122121010100001), we get a palindrome (222122020221222).

The spelling of 100001010121221 in words is "one hundred trillion, one billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".