212570661 has 8 divisors (see below), whose sum is σ = 291087904. Its totient is φ = 137883600.

The previous prime is 212570641. The next prime is 212570681. The reversal of 212570661 is 166075212.

It is an interprime number because it is at equal distance from previous prime (212570641) and next prime (212570681).

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

It is not a de Polignac number, because 212570661 - 2¹⁸ = 212308517 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 (212570641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957415 + ... + 957636.

It is an arithmetic number, because the mean of its divisors is an integer number (36385988).

Almost surely, 2^212570661 is an apocalyptic number.

It is an amenable number.

212570661 is a deficient number, since it is larger than the sum of its proper divisors (78517243).

212570661 is a wasteful number, since it uses less digits than its factorization.

212570661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915091.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 212570661 is about 14579.8031879721. The cubic root of 212570661 is about 596.8077319402.

The spelling of 212570661 in words is "two hundred twelve million, five hundred seventy thousand, six hundred sixty-one".