100102111221 has 24 divisors (see below), whose sum is σ = 155579338560.
Its totient is φ = 57083709312.
The previous prime is 100102111201. The next prime is 100102111223. The reversal of 100102111221 is 122111201001.
It is not a de Polignac number, because 100102111221 - 27 = 100102111093 is a prime.
It is a super-2 number, since 2×1001021112212 (a number of 23 digits) contains 22 as substring.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 100102111197 and 100102111206.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (100102111223) 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, 627556 + ... + 770733.
It is an arithmetic number, because the mean of its divisors is an integer number (6482472440).
Almost surely, 2100102111221 is an apocalyptic number.
It is an amenable number.
100102111221 is a deficient number, since it is larger than the sum of its proper divisors (55477227339).
100102111221 is a wasteful number, since it uses less digits than its factorization.
100102111221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1398793 (or 1398786 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 12.
Adding to 100102111221 its reverse (122111201001), we get a palindrome (222213312222).
The spelling of 100102111221 in words is "one hundred billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".