212021992 has 96 divisors (see below), whose sum is σ = 504377280. Its totient is φ = 81768960.

The previous prime is 212021983. The next prime is 212021993. The reversal of 212021992 is 299120212.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 212021992.

It is not an unprimeable number, because it can be changed into a prime (212021993) 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 23 ways as a sum of consecutive naturals, for example, 406692 + ... + 407212.

It is an arithmetic number, because the mean of its divisors is an integer number (5253930).

Almost surely, 2^212021992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212021992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252188640).

212021992 is an abundant number, since it is smaller than the sum of its proper divisors (292355288).

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

212021992 is a wasteful number, since it uses less digits than its factorization.

212021992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 212021992 is about 14560.9749673571. The cubic root of 212021992 is about 596.2938133635.

The spelling of 212021992 in words is "two hundred twelve million, twenty-one thousand, nine hundred ninety-two".