211971579990 has 32 divisors (see below), whose sum is σ = 538657192800. Its totient is φ = 53200710144.

The previous prime is 211971579959. The next prime is 211971580001. The reversal of 211971579990 is 99975179112.

211971579990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207814765 + ... + 207815784.

It is an arithmetic number, because the mean of its divisors is an integer number (16833037275).

Almost surely, 2^211971579990 is an apocalyptic number.

211971579990 is an abundant number, since it is smaller than the sum of its proper divisors (326685612810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211971579990 is a wasteful number, since it uses less digits than its factorization.

211971579990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415630576.

The product of its (nonzero) digits is 3214890, while the sum is 60.

The spelling of 211971579990 in words is "two hundred eleven billion, nine hundred seventy-one million, five hundred seventy-nine thousand, nine hundred ninety".