100670021 has 2 divisors, whose sum is σ = 100670022. Its totient is φ = 100670020.

The previous prime is 100669973. The next prime is 100670027. The reversal of 100670021 is 120076001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 49547521 = 7150^2 + 7039^2 .

It is an emirp because it is prime and its reverse (120076001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100670021 - 2⁶ = 100669957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100670027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50335010 + 50335011.

It is an arithmetic number, because the mean of its divisors is an integer number (50335011).

Almost surely, 2^100670021 is an apocalyptic number.

It is an amenable number.

100670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100670021 is an equidigital number, since it uses as much as digits as its factorization.

100670021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 100670021 is about 10033.4451211934. The cubic root of 100670021 is about 465.1932306720.

The spelling of 100670021 in words is "one hundred million, six hundred seventy thousand, twenty-one".