212111064 has 144 divisors (see below), whose sum is σ = 640490760. Its totient is φ = 63360000.

The previous prime is 212111051. The next prime is 212111071. The reversal of 212111064 is 460111212.

It is a super-2 number, since 2×212111064² = 89982206942424192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 844939 + ... + 845189.

Almost surely, 2^212111064 is an apocalyptic number.

212111064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212111064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320245380).

212111064 is an abundant number, since it is smaller than the sum of its proper divisors (428379696).

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

212111064 is a wasteful number, since it uses less digits than its factorization.

212111064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 212111064 is about 14564.0332325905. The cubic root of 212111064 is about 596.3773041468.

Adding to 212111064 its reverse (460111212), we get a palindrome (672222276).

The spelling of 212111064 in words is "two hundred twelve million, one hundred eleven thousand, sixty-four".