212011998 has 64 divisors (see below), whose sum is σ = 503117568. Its totient is φ = 58821120.

The previous prime is 212011993. The next prime is 212012033. The reversal of 212011998 is 899110212.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011993) 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, 38961 + ... + 44067.

It is an arithmetic number, because the mean of its divisors is an integer number (7861212).

Almost surely, 2^212011998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212011998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251558784).

212011998 is an abundant number, since it is smaller than the sum of its proper divisors (291105570).

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

212011998 is a wasteful number, since it uses less digits than its factorization.

212011998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 212011998 is about 14560.6317857434. The cubic root of 212011998 is about 596.2844441248.

The spelling of 212011998 in words is "two hundred twelve million, eleven thousand, nine hundred ninety-eight".