40206121 has 2 divisors, whose sum is σ = 40206122. Its totient is φ = 40206120.

The previous prime is 40206119. The next prime is 40206143. The reversal of 40206121 is 12160204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 14592400 = 5061^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 40206121 - 2¹ = 40206119 is a prime.

Together with 40206119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40206095 and 40206104.

It is not a weakly prime, because it can be changed into another prime (40206421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20103060 + 20103061.

It is an arithmetic number, because the mean of its divisors is an integer number (20103061).

Almost surely, 2^40206121 is an apocalyptic number.

It is an amenable number.

40206121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40206121 is an equidigital number, since it uses as much as digits as its factorization.

40206121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40206121 is about 6340.8296775737. The cubic root of 40206121 is about 342.5816197758.

Adding to 40206121 its reverse (12160204), we get a palindrome (52366325).

The spelling of 40206121 in words is "forty million, two hundred six thousand, one hundred twenty-one".