212256861 has 8 divisors (see below), whose sum is σ = 283102944. Its totient is φ = 141457680.

The previous prime is 212256851. The next prime is 212256893. The reversal of 212256861 is 168652212.

212256861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 212256861 - 2¹⁷ = 212125789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212256851) 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, 726 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (35387868).

Almost surely, 2^212256861 is an apocalyptic number.

It is an amenable number.

212256861 is a deficient number, since it is larger than the sum of its proper divisors (70846083).

212256861 is a wasteful number, since it uses less digits than its factorization.

212256861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23451.

The product of its digits is 11520, while the sum is 33.

The square root of 212256861 is about 14569.0377513410. The cubic root of 212256861 is about 596.5139151369.

The spelling of 212256861 in words is "two hundred twelve million, two hundred fifty-six thousand, eight hundred sixty-one".