40747812122021 has 2 divisors, whose sum is σ = 40747812122022. Its totient is φ = 40747812122020.

The previous prime is 40747812121997. The next prime is 40747812122033. The reversal of 40747812122021 is 12022121874704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30168984316900 + 10578827805121 = 5492630^2 + 3252511^2 .

It is a cyclic number.

It is not a de Polignac number, because 40747812122021 - 2¹⁰ = 40747812120997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40747812122021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40747812122071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20373906061010 + 20373906061011.

It is an arithmetic number, because the mean of its divisors is an integer number (20373906061011).

Almost surely, 2^{40747812122021} is an apocalyptic number.

It is an amenable number.

40747812122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40747812122021 is an equidigital number, since it uses as much as digits as its factorization.

40747812122021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100352, while the sum is 41.

Adding to 40747812122021 its reverse (12022121874704), we get a palindrome (52769933996725).

The spelling of 40747812122021 in words is "forty trillion, seven hundred forty-seven billion, eight hundred twelve million, one hundred twenty-two thousand, twenty-one".