212139470 has 8 divisors (see below), whose sum is σ = 381851064. Its totient is φ = 84855784.

The previous prime is 212139467. The next prime is 212139497. The reversal of 212139470 is 74931212.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10606964 + ... + 10606983.

It is an arithmetic number, because the mean of its divisors is an integer number (47731383).

Almost surely, 2^212139470 is an apocalyptic number.

212139470 is a deficient number, since it is larger than the sum of its proper divisors (169711594).

212139470 is a wasteful number, since it uses less digits than its factorization.

212139470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21213954.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 212139470 is about 14565.0084105709. The cubic root of 212139470 is about 596.4039253222.

The spelling of 212139470 in words is "two hundred twelve million, one hundred thirty-nine thousand, four hundred seventy".