100021213 has 4 divisors (see below), whose sum is σ = 100045440. Its totient is φ = 99996988.

The previous prime is 100021199. The next prime is 100021223. The reversal of 100021213 is 312120001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312120001 = 6343 ⋅49207.

It is a cyclic number.

It is not a de Polignac number, because 100021213 - 2¹³ = 100013021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100021213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4195 + ... + 14752.

It is an arithmetic number, because the mean of its divisors is an integer number (25011360).

Almost surely, 2^100021213 is an apocalyptic number.

It is an amenable number.

100021213 is a deficient number, since it is larger than the sum of its proper divisors (24227).

100021213 is an equidigital number, since it uses as much as digits as its factorization.

100021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24226.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 100021213 is about 10001.0605937570. The cubic root of 100021213 is about 464.1917017154.

Adding to 100021213 its reverse (312120001), we get a palindrome (412141214).

The spelling of 100021213 in words is "one hundred million, twenty-one thousand, two hundred thirteen".