212070221 has 8 divisors (see below), whose sum is σ = 235142688. Its totient is φ = 189630000.

The previous prime is 212070203. The next prime is 212070241. The reversal of 212070221 is 122070212.

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 212070221 - 2²⁶ = 144961357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212070221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212070241) 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, 157355 + ... + 158696.

It is an arithmetic number, because the mean of its divisors is an integer number (29392836).

Almost surely, 2^212070221 is an apocalyptic number.

It is an amenable number.

212070221 is a deficient number, since it is larger than the sum of its proper divisors (23072467).

212070221 is a wasteful number, since it uses less digits than its factorization.

212070221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316123.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 212070221 is about 14562.6309779518. The cubic root of 212070221 is about 596.3390232554.

Subtracting from 212070221 its reverse (122070212), we obtain a palindrome (90000009).

The spelling of 212070221 in words is "two hundred twelve million, seventy thousand, two hundred twenty-one".