211221200987 has 4 divisors (see below), whose sum is σ = 215206506720. Its totient is φ = 207235895256.

The previous prime is 211221200977. The next prime is 211221201041. The reversal of 211221200987 is 789002122112.

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 211221200987 - 2¹⁸ = 211220938843 is a prime.

It is a super-2 number, since 2×211221200987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221200917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992652787 + ... + 1992652892.

It is an arithmetic number, because the mean of its divisors is an integer number (53801626680).

Almost surely, 2^211221200987 is an apocalyptic number.

211221200987 is a deficient number, since it is larger than the sum of its proper divisors (3985305733).

211221200987 is an equidigital number, since it uses as much as digits as its factorization.

211221200987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985305732.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 211221200987 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thousand, nine hundred eighty-seven".