40755356021 has 2 divisors, whose sum is σ = 40755356022. Its totient is φ = 40755356020.

The previous prime is 40755355999. The next prime is 40755356039. The reversal of 40755356021 is 12065355704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32477085796 + 8278270225 = 180214^2 + 90985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40755356021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40755356821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20377678010 + 20377678011.

It is an arithmetic number, because the mean of its divisors is an integer number (20377678011).

Almost surely, 2^40755356021 is an apocalyptic number.

It is an amenable number.

40755356021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40755356021 is an equidigital number, since it uses as much as digits as its factorization.

40755356021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 40755356021 in words is "forty billion, seven hundred fifty-five million, three hundred fifty-six thousand, twenty-one".