42001222209901 has 2 divisors, whose sum is σ = 42001222209902. Its totient is φ = 42001222209900.

The previous prime is 42001222209899. The next prime is 42001222209997. The reversal of 42001222209901 is 10990222210024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35008640576100 + 6992581633801 = 5916810^2 + 2644349^2 .

It is a cyclic number.

It is not a de Polignac number, because 42001222209901 - 2¹ = 42001222209899 is a prime.

Together with 42001222209899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42001222209701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21000611104950 + 21000611104951.

It is an arithmetic number, because the mean of its divisors is an integer number (21000611104951).

Almost surely, 2^{42001222209901} is an apocalyptic number.

It is an amenable number.

42001222209901 is a deficient number, since it is larger than the sum of its proper divisors (1).

42001222209901 is an equidigital number, since it uses as much as digits as its factorization.

42001222209901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

Adding to 42001222209901 its reverse (10990222210024), we get a palindrome (52991444419925).

The spelling of 42001222209901 in words is "forty-two trillion, one billion, two hundred twenty-two million, two hundred nine thousand, nine hundred one".