212066621 has 16 divisors (see below), whose sum is σ = 233622144. Its totient is φ = 191290944.

The previous prime is 212066611. The next prime is 212066623. The reversal of 212066621 is 126660212.

It is not a de Polignac number, because 212066621 - 2¹⁸ = 211804477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212066623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238640 + ... + 239526.

It is an arithmetic number, because the mean of its divisors is an integer number (14601384).

Almost surely, 2^212066621 is an apocalyptic number.

It is an amenable number.

212066621 is a deficient number, since it is larger than the sum of its proper divisors (21555523).

212066621 is a wasteful number, since it uses less digits than its factorization.

212066621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 212066621 is about 14562.5073733887. The cubic root of 212066621 is about 596.3356488501.

The spelling of 212066621 in words is "two hundred twelve million, sixty-six thousand, six hundred twenty-one".