201212170687 has 8 divisors (see below), whose sum is σ = 219730257792. Its totient is φ = 182731762200.

The previous prime is 201212170639. The next prime is 201212170711. The reversal of 201212170687 is 786071212102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201212170687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212150687) 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, 9408483 + ... + 9429844.

It is an arithmetic number, because the mean of its divisors is an integer number (27466282224).

Almost surely, 2^201212170687 is an apocalyptic number.

201212170687 is a deficient number, since it is larger than the sum of its proper divisors (18518087105).

201212170687 is a wasteful number, since it uses less digits than its factorization.

201212170687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18839309.

The product of its (nonzero) digits is 18816, while the sum is 37.

Adding to 201212170687 its reverse (786071212102), we get a palindrome (987283382789).

The spelling of 201212170687 in words is "two hundred one billion, two hundred twelve million, one hundred seventy thousand, six hundred eighty-seven".