212171087 has 2 divisors, whose sum is σ = 212171088. Its totient is φ = 212171086.

The previous prime is 212171059. The next prime is 212171117. The reversal of 212171087 is 780171212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212171087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212177087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106085543 + 106085544.

It is an arithmetic number, because the mean of its divisors is an integer number (106085544).

Almost surely, 2^212171087 is an apocalyptic number.

212171087 is a deficient number, since it is larger than the sum of its proper divisors (1).

212171087 is an equidigital number, since it uses as much as digits as its factorization.

212171087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 212171087 is about 14566.0937454075. The cubic root of 212171087 is about 596.4335529475.

The spelling of 212171087 in words is "two hundred twelve million, one hundred seventy-one thousand, eighty-seven".