216871900287 has 16 divisors (see below), whose sum is σ = 330500013312. Its totient is φ = 123916095360.

The previous prime is 216871900261. The next prime is 216871900313. The reversal of 216871900287 is 782009178612.

It is an interprime number because it is at equal distance from previous prime (216871900261) and next prime (216871900313).

It is not a de Polignac number, because 216871900287 - 2¹¹ = 216871898239 is a prime.

It is a super-2 number, since 2×216871900287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216871900207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193818 + ... + 686519.

It is an arithmetic number, because the mean of its divisors is an integer number (20656250832).

Almost surely, 2^216871900287 is an apocalyptic number.

216871900287 is a deficient number, since it is larger than the sum of its proper divisors (113628113025).

216871900287 is a wasteful number, since it uses less digits than its factorization.

216871900287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892078.

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 216871900287 in words is "two hundred sixteen billion, eight hundred seventy-one million, nine hundred thousand, two hundred eighty-seven".