211980971 has 8 divisors (see below), whose sum is σ = 213617280. Its totient is φ = 210350592.

The previous prime is 211980961. The next prime is 211980983. The reversal of 211980971 is 179089112.

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 211980971 - 2²⁶ = 144872107 is a prime.

It is a super-2 number, since 2×211980971² = 89871864132205682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211980931) 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 7 ways as a sum of consecutive naturals, for example, 91301 + ... + 93593.

It is an arithmetic number, because the mean of its divisors is an integer number (26702160).

Almost surely, 2^211980971 is an apocalyptic number.

211980971 is a deficient number, since it is larger than the sum of its proper divisors (1636309).

211980971 is a wasteful number, since it uses less digits than its factorization.

211980971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 211980971 is about 14559.5663053540. The cubic root of 211980971 is about 596.2553548590.

The spelling of 211980971 in words is "two hundred eleven million, nine hundred eighty thousand, nine hundred seventy-one".