100212021 has 48 divisors (see below), whose sum is σ = 183025024. Its totient is φ = 51414912.

The previous prime is 100211981. The next prime is 100212043. The reversal of 100212021 is 120212001.

It is not a de Polignac number, because 100212021 - 2¹¹ = 100209973 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100211994 and 100212012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212071) 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, 28650 + ... + 31956.

Almost surely, 2^100212021 is an apocalyptic number.

It is an amenable number.

100212021 is a deficient number, since it is larger than the sum of its proper divisors (82813003).

100212021 is a wasteful number, since it uses less digits than its factorization.

100212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3367 counting only the distinct ones).

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

The square root of 100212021 is about 10010.5954368359. The cubic root of 100212021 is about 464.4866898994.

Adding to 100212021 its reverse (120212001), we get a palindrome (220424022).

The spelling of 100212021 in words is "one hundred million, two hundred twelve thousand, twenty-one".