211447947 has 24 divisors (see below), whose sum is σ = 301704192. Its totient is φ = 131475520.

The previous prime is 211447937. The next prime is 211447949. The reversal of 211447947 is 749744112.

It is not a de Polignac number, because 211447947 - 2⁶ = 211447883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211447949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115078 + ... + 116900.

It is an arithmetic number, because the mean of its divisors is an integer number (12571008).

Almost surely, 2^211447947 is an apocalyptic number.

211447947 is a deficient number, since it is larger than the sum of its proper divisors (90256245).

211447947 is a wasteful number, since it uses less digits than its factorization.

211447947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1890 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 211447947 is about 14541.2498431187. The cubic root of 211447947 is about 595.7551760470.

The spelling of 211447947 in words is "two hundred eleven million, four hundred forty-seven thousand, nine hundred forty-seven".