212006557 has 8 divisors (see below), whose sum is σ = 242559296. Its totient is φ = 181520352.

The previous prime is 212006521. The next prime is 212006563. The reversal of 212006557 is 755600212.

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

It is a cyclic number.

It is not a de Polignac number, because 212006557 - 2⁷ = 212006429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212006257) 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, 9603 + ... + 22720.

It is an arithmetic number, because the mean of its divisors is an integer number (30319912).

Almost surely, 2^212006557 is an apocalyptic number.

It is an amenable number.

212006557 is a deficient number, since it is larger than the sum of its proper divisors (30552739).

212006557 is an equidigital number, since it uses as much as digits as its factorization.

212006557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33267.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 212006557 is about 14560.4449451244. Note that the first 3 decimals coincide. The cubic root of 212006557 is about 596.2793431376.

Adding to 212006557 its reverse (755600212), we get a palindrome (967606769).

The spelling of 212006557 in words is "two hundred twelve million, six thousand, five hundred fifty-seven".