211010221987 has 4 divisors (see below), whose sum is σ = 214469406016. Its totient is φ = 207551037960.

The previous prime is 211010221963. The next prime is 211010221991. The reversal of 211010221987 is 789122010112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211010221987 - 2¹¹ = 211010219939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211010251987) 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 3 ways as a sum of consecutive naturals, for example, 1729591923 + ... + 1729592044.

It is an arithmetic number, because the mean of its divisors is an integer number (53617351504).

Almost surely, 2^211010221987 is an apocalyptic number.

211010221987 is a deficient number, since it is larger than the sum of its proper divisors (3459184029).

211010221987 is an equidigital number, since it uses as much as digits as its factorization.

211010221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459184028.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 211010221987 in words is "two hundred eleven billion, ten million, two hundred twenty-one thousand, nine hundred eighty-seven".