100212000021 has 24 divisors (see below), whose sum is σ = 169900400384. Its totient is φ = 55716323040.

The previous prime is 100212000019. The next prime is 100212000089. The reversal of 100212000021 is 120000212001.

It is not a de Polignac number, because 100212000021 - 2¹ = 100212000019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100211999967 and 100212000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212000521) 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, 21493165 + ... + 21497826.

Almost surely, 2^100212000021 is an apocalyptic number.

It is an amenable number.

100212000021 is a deficient number, since it is larger than the sum of its proper divisors (69688400363).

100212000021 is a wasteful number, since it uses less digits than its factorization.

100212000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42991041 (or 42991038 counting only the distinct ones).

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

Adding to 100212000021 its reverse (120000212001), we get a palindrome (220212212022).

The spelling of 100212000021 in words is "one hundred billion, two hundred twelve million, twenty-one", and thus it is an aban number.