1721868371971 has 8 divisors (see below), whose sum is σ = 1885039326144. Its totient is φ = 1559803662120.

The previous prime is 1721868371959. The next prime is 1721868371987. The reversal of 1721868371971 is 1791738681271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1721868371971 - 2⁷ = 1721868371843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721868371941) 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 7 ways as a sum of consecutive naturals, for example, 276557821 + ... + 276564046.

It is an arithmetic number, because the mean of its divisors is an integer number (235629915768).

Almost surely, 2^{1721868371971} is an apocalyptic number.

1721868371971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1721868371971 is a deficient number, since it is larger than the sum of its proper divisors (163170954173).

1721868371971 is a wasteful number, since it uses less digits than its factorization.

1721868371971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553122161.

The product of its digits is 7112448, while the sum is 61.

The spelling of 1721868371971 in words is "one trillion, seven hundred twenty-one billion, eight hundred sixty-eight million, three hundred seventy-one thousand, nine hundred seventy-one".