42221352961 has 2 divisors, whose sum is σ = 42221352962. Its totient is φ = 42221352960.

The previous prime is 42221352923. The next prime is 42221353019. The reversal of 42221352961 is 16925312224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40092453361 + 2128899600 = 200231^2 + 46140^2 .

It is a cyclic number.

It is not a de Polignac number, because 42221352961 - 2⁹ = 42221352449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42221352961.

It is not a weakly prime, because it can be changed into another prime (42221302961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110676480 + 21110676481.

It is an arithmetic number, because the mean of its divisors is an integer number (21110676481).

Almost surely, 2^42221352961 is an apocalyptic number.

It is an amenable number.

42221352961 is a deficient number, since it is larger than the sum of its proper divisors (1).

42221352961 is an equidigital number, since it uses as much as digits as its factorization.

42221352961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The spelling of 42221352961 in words is "forty-two billion, two hundred twenty-one million, three hundred fifty-two thousand, nine hundred sixty-one".