212287881 has 8 divisors (see below), whose sum is σ = 304823680. Its totient is φ = 130638672.

The previous prime is 212287879. The next prime is 212287883. The reversal of 212287881 is 188782212.

It is an interprime number because it is at equal distance from previous prime (212287879) and next prime (212287883).

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

It is not a de Polignac number, because 212287881 - 2¹ = 212287879 is a prime.

It is a super-2 number, since 2×212287881² = 90132288838940322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5443279 = 212287881 / (2 + 1 + 2 + 2 + 8 + 7 + 8 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212287883) 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, 2721601 + ... + 2721678.

It is an arithmetic number, because the mean of its divisors is an integer number (38102960).

Almost surely, 2^212287881 is an apocalyptic number.

It is an amenable number.

212287881 is a deficient number, since it is larger than the sum of its proper divisors (92535799).

212287881 is a wasteful number, since it uses less digits than its factorization.

212287881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443295.

The product of its digits is 28672, while the sum is 39.

The square root of 212287881 is about 14570.1022988859. The cubic root of 212287881 is about 596.5429726355.

The spelling of 212287881 in words is "two hundred twelve million, two hundred eighty-seven thousand, eight hundred eighty-one".