211947973 has 8 divisors (see below), whose sum is σ = 213440000. Its totient is φ = 210461328.

The previous prime is 211947889. The next prime is 211947991. The reversal of 211947973 is 379749112.

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 211947973 - 2¹³ = 211939781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211941973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105028 + ... + 107026.

It is an arithmetic number, because the mean of its divisors is an integer number (26680000).

Almost surely, 2^211947973 is an apocalyptic number.

It is an amenable number.

211947973 is a deficient number, since it is larger than the sum of its proper divisors (1492027).

211947973 is a wasteful number, since it uses less digits than its factorization.

211947973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its digits is 95256, while the sum is 43.

The square root of 211947973 is about 14558.4330544190. The cubic root of 211947973 is about 596.2244145737.

The spelling of 211947973 in words is "two hundred eleven million, nine hundred forty-seven thousand, nine hundred seventy-three".