2171387017651 has 8 divisors (see below), whose sum is σ = 2174043722240. Its totient is φ = 2168730893448.

The previous prime is 2171387017643. The next prime is 2171387017673. The reversal of 2171387017651 is 1567107831712.

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

It is a cyclic number.

It is not a de Polignac number, because 2171387017651 - 2³ = 2171387017643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2171387017595 and 2171387017604.

It is not an unprimeable number, because it can be changed into a prime (2171387017691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7593610 + ... + 7874368.

It is an arithmetic number, because the mean of its divisors is an integer number (271755465280).

Almost surely, 2^{2171387017651} is an apocalyptic number.

2171387017651 is a deficient number, since it is larger than the sum of its proper divisors (2656704589).

2171387017651 is an equidigital number, since it uses as much as digits as its factorization.

2171387017651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290193.

The product of its (nonzero) digits is 493920, while the sum is 49.

The spelling of 2171387017651 in words is "two trillion, one hundred seventy-one billion, three hundred eighty-seven million, seventeen thousand, six hundred fifty-one".