211995522978 has 16 divisors (see below), whose sum is σ = 424569487296. Its totient is φ = 70568767440.

The previous prime is 211995522839. The next prime is 211995522979. The reversal of 211995522978 is 879225599112.

It is not an unprimeable number, because it can be changed into a prime (211995522979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24096958 + ... + 24105753.

It is an arithmetic number, because the mean of its divisors is an integer number (26535592956).

Almost surely, 2^211995522978 is an apocalyptic number.

211995522978 is an abundant number, since it is smaller than the sum of its proper divisors (212573964318).

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

211995522978 is a wasteful number, since it uses less digits than its factorization.

211995522978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48203449.

The product of its digits is 8164800, while the sum is 60.

The spelling of 211995522978 in words is "two hundred eleven billion, nine hundred ninety-five million, five hundred twenty-two thousand, nine hundred seventy-eight".