40020435121 has 2 divisors, whose sum is σ = 40020435122. Its totient is φ = 40020435120.

The previous prime is 40020435101. The next prime is 40020435139. The reversal of 40020435121 is 12153402004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27237871521 + 12782563600 = 165039^2 + 113060^2 .

It is a cyclic number.

It is not a de Polignac number, because 40020435121 - 2⁵ = 40020435089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40020435092 and 40020435101.

It is not a weakly prime, because it can be changed into another prime (40020435101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010217560 + 20010217561.

It is an arithmetic number, because the mean of its divisors is an integer number (20010217561).

Almost surely, 2^40020435121 is an apocalyptic number.

It is an amenable number.

40020435121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40020435121 is an equidigital number, since it uses as much as digits as its factorization.

40020435121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 40020435121 its reverse (12153402004), we get a palindrome (52173837125).

The spelling of 40020435121 in words is "forty billion, twenty million, four hundred thirty-five thousand, one hundred twenty-one".