1720221051227 has 4 divisors (see below), whose sum is σ = 1965966915696. Its totient is φ = 1474475186760.

The previous prime is 1720221051223. The next prime is 1720221051239. The reversal of 1720221051227 is 7221501220271.

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 1720221051227 - 2² = 1720221051223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720221051193 and 1720221051202.

It is not an unprimeable number, because it can be changed into a prime (1720221051223) 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, 122872932224 + ... + 122872932237.

It is an arithmetic number, because the mean of its divisors is an integer number (491491728924).

Almost surely, 2^{1720221051227} is an apocalyptic number.

1720221051227 is a deficient number, since it is larger than the sum of its proper divisors (245745864469).

1720221051227 is an equidigital number, since it uses as much as digits as its factorization.

1720221051227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245745864468.

The product of its (nonzero) digits is 7840, while the sum is 32.

Adding to 1720221051227 its reverse (7221501220271), we get a palindrome (8941722271498).

The spelling of 1720221051227 in words is "one trillion, seven hundred twenty billion, two hundred twenty-one million, fifty-one thousand, two hundred twenty-seven".