211990998 has 8 divisors (see below), whose sum is σ = 423982008. Its totient is φ = 70663664.

The previous prime is 211990993. The next prime is 211991027. The reversal of 211990998 is 899099112.

It is a sphenic number, since it is the product of 3 distinct primes.

211990998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211990991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17665911 + ... + 17665922.

It is an arithmetic number, because the mean of its divisors is an integer number (52997751).

Almost surely, 2^211990998 is an apocalyptic number.

211990998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

211990998 is a wasteful number, since it uses less digits than its factorization.

211990998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35331838.

The product of its (nonzero) digits is 104976, while the sum is 48.

The square root of 211990998 is about 14559.9106453302. The cubic root of 211990998 is about 596.2647559516.

The spelling of 211990998 in words is "two hundred eleven million, nine hundred ninety thousand, nine hundred ninety-eight".