42240121344409 has 2 divisors, whose sum is σ = 42240121344410. Its totient is φ = 42240121344408.

The previous prime is 42240121344353. The next prime is 42240121344431. The reversal of 42240121344409 is 90444312104224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37839377482384 + 4400743862025 = 6151372^2 + 2097795^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240121344409 - 2¹⁷ = 42240121213337 is a prime.

It is not a weakly prime, because it can be changed into another prime (42240121344479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120060672204 + 21120060672205.

It is an arithmetic number, because the mean of its divisors is an integer number (21120060672205).

Almost surely, 2^{42240121344409} is an apocalyptic number.

It is an amenable number.

42240121344409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240121344409 is an equidigital number, since it uses as much as digits as its factorization.

42240121344409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 42240121344409 in words is "forty-two trillion, two hundred forty billion, one hundred twenty-one million, three hundred forty-four thousand, four hundred nine".