1721006112457 has 4 divisors (see below), whose sum is σ = 1721787324880. Its totient is φ = 1720224900036.

The previous prime is 1721006112443. The next prime is 1721006112473. The reversal of 1721006112457 is 7542116001271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1721006112457 - 2¹¹ = 1721006110409 is a prime.

It is a super-2 number, since 2×1721006112457² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721006112757) 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 in 3 ways as a sum of consecutive naturals, for example, 390602907 + ... + 390607312.

It is an arithmetic number, because the mean of its divisors is an integer number (430446831220).

Almost surely, 2^{1721006112457} is an apocalyptic number.

It is an amenable number.

1721006112457 is a deficient number, since it is larger than the sum of its proper divisors (781212423).

1721006112457 is an equidigital number, since it uses as much as digits as its factorization.

1721006112457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781212422.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 1721006112457 in words is "one trillion, seven hundred twenty-one billion, six million, one hundred twelve thousand, four hundred fifty-seven".