212129247 has 16 divisors (see below), whose sum is σ = 326702592. Its totient is φ = 121000320.

The previous prime is 212129233. The next prime is 212129257. The reversal of 212129247 is 742921212.

It is not a de Polignac number, because 212129247 - 2⁴ = 212129231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212129257) 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 15 ways as a sum of consecutive naturals, for example, 188503 + ... + 189624.

It is an arithmetic number, because the mean of its divisors is an integer number (20418912).

Almost surely, 2^212129247 is an apocalyptic number.

212129247 is a deficient number, since it is larger than the sum of its proper divisors (114573345).

212129247 is a wasteful number, since it uses less digits than its factorization.

212129247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378158.

The product of its digits is 4032, while the sum is 30.

The square root of 212129247 is about 14564.6574625015. The cubic root of 212129247 is about 596.3943449343.

The spelling of 212129247 in words is "two hundred twelve million, one hundred twenty-nine thousand, two hundred forty-seven".