212920818 has 64 divisors (see below), whose sum is σ = 496679040. Its totient is φ = 60134400.

The previous prime is 212920787. The next prime is 212920819. The reversal of 212920818 is 818029212.

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

It is not an unprimeable number, because it can be changed into a prime (212920819) 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, 121428 + ... + 123168.

It is an arithmetic number, because the mean of its divisors is an integer number (7760610).

Almost surely, 2^212920818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212920818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248339520).

212920818 is an abundant number, since it is smaller than the sum of its proper divisors (283758222).

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

212920818 is a wasteful number, since it uses less digits than its factorization.

212920818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 212920818 is about 14591.8065365465. The cubic root of 212920818 is about 597.1352493305.

The spelling of 212920818 in words is "two hundred twelve million, nine hundred twenty thousand, eight hundred eighteen".