212161147 has 4 divisors (see below), whose sum is σ = 231448536. Its totient is φ = 192873760.

The previous prime is 212161127. The next prime is 212161153. The reversal of 212161147 is 741161212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212161147 - 2²³ = 203772539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212161127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9643678 + ... + 9643699.

It is an arithmetic number, because the mean of its divisors is an integer number (57862134).

Almost surely, 2^212161147 is an apocalyptic number.

212161147 is a deficient number, since it is larger than the sum of its proper divisors (19287389).

212161147 is a wasteful number, since it uses less digits than its factorization.

212161147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19287388.

The product of its digits is 672, while the sum is 25.

The square root of 212161147 is about 14565.7525380600. The cubic root of 212161147 is about 596.4242387000.

The spelling of 212161147 in words is "two hundred twelve million, one hundred sixty-one thousand, one hundred forty-seven".