212139660667 has 8 divisors (see below), whose sum is σ = 233810911152. Its totient is φ = 190866048000.

The previous prime is 212139660641. The next prime is 212139660679. The reversal of 212139660667 is 766066931212.

It is a happy number.

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 212139660667 - 2¹⁹ = 212139136379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212139660667.

It is not an unprimeable number, because it can be changed into a prime (212139660637) 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, 99408334 + ... + 99410467.

It is an arithmetic number, because the mean of its divisors is an integer number (29226363894).

Almost surely, 2^212139660667 is an apocalyptic number.

212139660667 is a deficient number, since it is larger than the sum of its proper divisors (21671250485).

212139660667 is a wasteful number, since it uses less digits than its factorization.

212139660667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198818909.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 212139660667 in words is "two hundred twelve billion, one hundred thirty-nine million, six hundred sixty thousand, six hundred sixty-seven".