212300661 has 8 divisors (see below), whose sum is σ = 297965920. Its totient is φ = 134084592.

The previous prime is 212300653. The next prime is 212300723. The reversal of 212300661 is 166003212.

It is a happy number.

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

It is not a de Polignac number, because 212300661 - 2³ = 212300653 is a prime.

It is a super-2 number, since 2×212300661² = 90143141322073842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212300651) 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, 1862230 + ... + 1862343.

It is an arithmetic number, because the mean of its divisors is an integer number (37245740).

Almost surely, 2^212300661 is an apocalyptic number.

It is an amenable number.

212300661 is a deficient number, since it is larger than the sum of its proper divisors (85665259).

212300661 is a wasteful number, since it uses less digits than its factorization.

212300661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724595.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 212300661 is about 14570.5408616153. The cubic root of 212300661 is about 596.5549432767.

Adding to 212300661 its reverse (166003212), we get a palindrome (378303873).

The spelling of 212300661 in words is "two hundred twelve million, three hundred thousand, six hundred sixty-one".