211109990 has 64 divisors (see below), whose sum is σ = 472058496. Its totient is φ = 66189312.

The previous prime is 211109989. The next prime is 211109993. The reversal of 211109990 is 99901112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211109993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101804 + ... + 103856.

It is an arithmetic number, because the mean of its divisors is an integer number (7375914).

Almost surely, 2^211109990 is an apocalyptic number.

211109990 is an abundant number, since it is smaller than the sum of its proper divisors (260948506).

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

211109990 is a wasteful number, since it uses less digits than its factorization.

211109990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 211109990 is about 14529.6245650051. The cubic root of 211109990 is about 595.4376085366.

The spelling of 211109990 in words is "two hundred eleven million, one hundred nine thousand, nine hundred ninety".