100042121 has 2 divisors, whose sum is σ = 100042122. Its totient is φ = 100042120.

The previous prime is 100042109. The next prime is 100042147. The reversal of 100042121 is 121240001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 38576521 = 7840^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 100042121 - 2⁶ = 100042057 is a prime.

It is not a weakly prime, because it can be changed into another prime (100042421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50021060 + 50021061.

It is an arithmetic number, because the mean of its divisors is an integer number (50021061).

Almost surely, 2^100042121 is an apocalyptic number.

It is an amenable number.

100042121 is a deficient number, since it is larger than the sum of its proper divisors (1).

100042121 is an equidigital number, since it uses as much as digits as its factorization.

100042121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 100042121 is about 10002.1058282744. The cubic root of 100042121 is about 464.2240436678.

Adding to 100042121 its reverse (121240001), we get a palindrome (221282122).

The spelling of 100042121 in words is "one hundred million, forty-two thousand, one hundred twenty-one".