2171021729385 has 16 divisors (see below), whose sum is σ = 3473653835520. Its totient is φ = 1157871899520.

The previous prime is 2171021729351. The next prime is 2171021729411. The reversal of 2171021729385 is 5839271201712.

It is not a de Polignac number, because 2171021729385 - 2²¹ = 2171019632233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3987520 + ... + 4499150.

It is an arithmetic number, because the mean of its divisors is an integer number (217103364720).

Almost surely, 2^{2171021729385} is an apocalyptic number.

It is an amenable number.

2171021729385 is a deficient number, since it is larger than the sum of its proper divisors (1302632106135).

2171021729385 is a wasteful number, since it uses less digits than its factorization.

2171021729385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794528.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 2171021729385 in words is "two trillion, one hundred seventy-one billion, twenty-one million, seven hundred twenty-nine thousand, three hundred eighty-five".