100000021212 has 144 divisors (see below), whose sum is σ = 319519974592. Its totient is φ = 25660800000.

The previous prime is 100000021211. The next prime is 100000021217. The reversal of 100000021212 is 212120000001.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100000021194 and 100000021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000021211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 291289 + ... + 533712.

Almost surely, 2^100000021212 is an apocalyptic number.

100000021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

100000021212 is an abundant number, since it is smaller than the sum of its proper divisors (219519953380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100000021212 is a wasteful number, since it uses less digits than its factorization.

100000021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825068 (or 825063 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 100000021212 its reverse (212120000001), we get a palindrome (312120021213).

The spelling of 100000021212 in words is "one hundred billion, twenty-one thousand, two hundred twelve".