42562551221 has 2 divisors, whose sum is σ = 42562551222. Its totient is φ = 42562551220.

The previous prime is 42562551217. The next prime is 42562551247. The reversal of 42562551221 is 12215526524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30733596100 + 11828955121 = 175310^2 + 108761^2 .

It is a cyclic number.

It is not a de Polignac number, because 42562551221 - 2² = 42562551217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42562541221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21281275610 + 21281275611.

It is an arithmetic number, because the mean of its divisors is an integer number (21281275611).

Almost surely, 2^42562551221 is an apocalyptic number.

It is an amenable number.

42562551221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42562551221 is an equidigital number, since it uses as much as digits as its factorization.

42562551221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 35.

The spelling of 42562551221 in words is "forty-two billion, five hundred sixty-two million, five hundred fifty-one thousand, two hundred twenty-one".