211918492490 has 16 divisors (see below), whose sum is σ = 381532825800. Its totient is φ = 84749721600.

The previous prime is 211918492463. The next prime is 211918492529. The reversal of 211918492490 is 94294819112.

211918492490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 143828287009 + 68090205481 = 379247^2 + 260941^2 .

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 7 ways as a sum of consecutive naturals, for example, 2159015 + ... + 2255034.

Almost surely, 2^211918492490 is an apocalyptic number.

211918492490 is a deficient number, since it is larger than the sum of its proper divisors (169614333310).

211918492490 is a wasteful number, since it uses less digits than its factorization.

211918492490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418857.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 211918492490 in words is "two hundred eleven billion, nine hundred eighteen million, four hundred ninety-two thousand, four hundred ninety".