100213121 has 4 divisors (see below), whose sum is σ = 101420592. Its totient is φ = 99005652.

The previous prime is 100213117. The next prime is 100213123. The reversal of 100213121 is 121312001.

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.

It is a cyclic number.

It is not a de Polignac number, because 100213121 - 2² = 100213117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100213123) 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, 603611 + ... + 603776.

It is an arithmetic number, because the mean of its divisors is an integer number (25355148).

Almost surely, 2^100213121 is an apocalyptic number.

It is an amenable number.

100213121 is a deficient number, since it is larger than the sum of its proper divisors (1207471).

100213121 is an equidigital number, since it uses as much as digits as its factorization.

100213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207470.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 100213121 is about 10010.6503784719. The cubic root of 100213121 is about 464.4883894078.

Adding to 100213121 its reverse (121312001), we get a palindrome (221525122).

The spelling of 100213121 in words is "one hundred million, two hundred thirteen thousand, one hundred twenty-one".