211879971 has 6 divisors (see below), whose sum is σ = 306048860. Its totient is φ = 141253308.

The previous prime is 211879939. The next prime is 211879981. The reversal of 211879971 is 179978112.

It is a happy number.

It is not a de Polignac number, because 211879971 - 2⁵ = 211879939 is a prime.

It is a super-2 number, since 2×211879971² = 89786244221921682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211879931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11771101 + ... + 11771118.

Almost surely, 2^211879971 is an apocalyptic number.

211879971 is a deficient number, since it is larger than the sum of its proper divisors (94168889).

211879971 is a wasteful number, since it uses less digits than its factorization.

211879971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23542225 (or 23542222 counting only the distinct ones).

The product of its digits is 63504, while the sum is 45.

The square root of 211879971 is about 14556.0973821969. The cubic root of 211879971 is about 596.1606429651.

The spelling of 211879971 in words is "two hundred eleven million, eight hundred seventy-nine thousand, nine hundred seventy-one".