100211021 has 2 divisors, whose sum is σ = 100211022. Its totient is φ = 100211020.

The previous prime is 100211009. The next prime is 100211057. The reversal of 100211021 is 120112001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71588521 + 28622500 = 8461^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 100211021 - 2¹⁰ = 100209997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105510 + 50105511.

It is an arithmetic number, because the mean of its divisors is an integer number (50105511).

Almost surely, 2^100211021 is an apocalyptic number.

It is an amenable number.

100211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100211021 is an equidigital number, since it uses as much as digits as its factorization.

100211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100211021 is about 10010.5454896324. The cubic root of 100211021 is about 464.4851448811.

Adding to 100211021 its reverse (120112001), we get a palindrome (220323022).

The spelling of 100211021 in words is "one hundred million, two hundred eleven thousand, twenty-one".