40121043217 has 2 divisors, whose sum is σ = 40121043218. Its totient is φ = 40121043216.

The previous prime is 40121043187. The next prime is 40121043269. The reversal of 40121043217 is 71234012104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30356441361 + 9764601856 = 174231^2 + 98816^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121043217 - 2²³ = 40112654609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40121043191 and 40121043200.

It is not a weakly prime, because it can be changed into another prime (40121040217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060521608 + 20060521609.

It is an arithmetic number, because the mean of its divisors is an integer number (20060521609).

Almost surely, 2^40121043217 is an apocalyptic number.

It is an amenable number.

40121043217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121043217 is an equidigital number, since it uses as much as digits as its factorization.

40121043217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The spelling of 40121043217 in words is "forty billion, one hundred twenty-one million, forty-three thousand, two hundred seventeen".