221771340051 has 4 divisors (see below), whose sum is σ = 295695120072. Its totient is φ = 147847560032.

The previous prime is 221771340047. The next prime is 221771340053. The reversal of 221771340051 is 150043177122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221771340051 - 2² = 221771340047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221771339994 and 221771340021.

It is not an unprimeable number, because it can be changed into a prime (221771340053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36961890006 + ... + 36961890011.

It is an arithmetic number, because the mean of its divisors is an integer number (73923780018).

Almost surely, 2^221771340051 is an apocalyptic number.

221771340051 is a deficient number, since it is larger than the sum of its proper divisors (73923780021).

221771340051 is an equidigital number, since it uses as much as digits as its factorization.

221771340051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73923780020.

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 221771340051 in words is "two hundred twenty-one billion, seven hundred seventy-one million, three hundred forty thousand, fifty-one".