221420582377 has 2 divisors, whose sum is σ = 221420582378. Its totient is φ = 221420582376.

The previous prime is 221420582351. The next prime is 221420582407. The reversal of 221420582377 is 773285024122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143350075456 + 78070506921 = 378616^2 + 279411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221420582377 is a prime.

It is not a weakly prime, because it can be changed into another prime (221420592377) 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, 110710291188 + 110710291189.

It is an arithmetic number, because the mean of its divisors is an integer number (110710291189).

Almost surely, 2^221420582377 is an apocalyptic number.

It is an amenable number.

221420582377 is a deficient number, since it is larger than the sum of its proper divisors (1).

221420582377 is an equidigital number, since it uses as much as digits as its factorization.

221420582377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 221420582377 in words is "two hundred twenty-one billion, four hundred twenty million, five hundred eighty-two thousand, three hundred seventy-seven".