40121155121 has 2 divisors, whose sum is σ = 40121155122. Its totient is φ = 40121155120.

The previous prime is 40121155111. The next prime is 40121155147. The reversal of 40121155121 is 12155112104.

It is a happy number.

40121155121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36209903521 + 3911251600 = 190289^2 + 62540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40121155121 is a prime.

It is not a weakly prime, because it can be changed into another prime (40121155111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060577560 + 20060577561.

It is an arithmetic number, because the mean of its divisors is an integer number (20060577561).

Almost surely, 2^40121155121 is an apocalyptic number.

It is an amenable number.

40121155121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121155121 is an equidigital number, since it uses as much as digits as its factorization.

40121155121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 40121155121 its reverse (12155112104), we get a palindrome (52276267225).

The spelling of 40121155121 in words is "forty billion, one hundred twenty-one million, one hundred fifty-five thousand, one hundred twenty-one".