211204981 has 16 divisors (see below), whose sum is σ = 237984768. Its totient is φ = 186134400.

The previous prime is 211204979. The next prime is 211204993. The reversal of 211204981 is 189402112.

It is a cyclic number.

It is not a de Polignac number, because 211204981 - 2¹ = 211204979 is a prime.

It is a super-2 number, since 2×211204981² = 89215087998420722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211204901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20836 + ... + 29266.

It is an arithmetic number, because the mean of its divisors is an integer number (14874048).

Almost surely, 2^211204981 is an apocalyptic number.

It is an amenable number.

211204981 is a deficient number, since it is larger than the sum of its proper divisors (26779787).

211204981 is a wasteful number, since it uses less digits than its factorization.

211204981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 211204981 is about 14532.8930705486. The cubic root of 211204981 is about 595.5269027991.

The spelling of 211204981 in words is "two hundred eleven million, two hundred four thousand, nine hundred eighty-one".