40212101 has 2 divisors, whose sum is σ = 40212102. Its totient is φ = 40212100.

The previous prime is 40212091. The next prime is 40212121. The reversal of 40212101 is 10121204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34456900 + 5755201 = 5870^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 40212101 - 2¹⁴ = 40195717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40212121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106050 + 20106051.

It is an arithmetic number, because the mean of its divisors is an integer number (20106051).

Almost surely, 2^40212101 is an apocalyptic number.

It is an amenable number.

40212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

40212101 is an equidigital number, since it uses as much as digits as its factorization.

40212101 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 40212101 is about 6341.3012071656. The cubic root of 40212101 is about 342.5986033965.

Adding to 40212101 its reverse (10121204), we get a palindrome (50333305).

The spelling of 40212101 in words is "forty million, two hundred twelve thousand, one hundred one".