211099440 has 40 divisors (see below), whose sum is σ = 654409008. Its totient is φ = 56293120.

The previous prime is 211099433. The next prime is 211099453. The reversal of 211099440 is 44990112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 211099398 and 211099407.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 439551 + ... + 440030.

Almost surely, 2^211099440 is an apocalyptic number.

211099440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211099440 is an abundant number, since it is smaller than the sum of its proper divisors (443309568).

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

211099440 is a wasteful number, since it uses less digits than its factorization.

211099440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879597 (or 879591 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 211099440 is about 14529.2615091064. The cubic root of 211099440 is about 595.4276895817.

The spelling of 211099440 in words is "two hundred eleven million, ninety-nine thousand, four hundred forty".