212172087 has 8 divisors (see below), whose sum is σ = 299537136. Its totient is φ = 133127552.

The previous prime is 212172043. The next prime is 212172113. The reversal of 212172087 is 780271212.

It is a happy number.

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-212172087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212172017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2080068 + ... + 2080169.

It is an arithmetic number, because the mean of its divisors is an integer number (37442142).

Almost surely, 2^212172087 is an apocalyptic number.

212172087 is a deficient number, since it is larger than the sum of its proper divisors (87365049).

212172087 is a wasteful number, since it uses less digits than its factorization.

212172087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160257.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 212172087 is about 14566.1280716599. The cubic root of 212172087 is about 596.4344899785.

The spelling of 212172087 in words is "two hundred twelve million, one hundred seventy-two thousand, eighty-seven".