211992990 has 32 divisors (see below), whose sum is σ = 555037056. Its totient is φ = 51392160.

The previous prime is 211992961. The next prime is 211992997. The reversal of 211992990 is 99299112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211992997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320872 + ... + 321531.

It is an arithmetic number, because the mean of its divisors is an integer number (17344908).

Almost surely, 2^211992990 is an apocalyptic number.

211992990 is an abundant number, since it is smaller than the sum of its proper divisors (343044066).

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

211992990 is a wasteful number, since it uses less digits than its factorization.

211992990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642424.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 211992990 is about 14559.9790521827. The cubic root of 211992990 is about 596.2666235713.

The spelling of 211992990 in words is "two hundred eleven million, nine hundred ninety-two thousand, nine hundred ninety".