216021512 has 48 divisors (see below), whose sum is σ = 469124160.
Its totient is φ = 91352448.
The previous prime is 216021511. The next prime is 216021517. The reversal of 216021512 is 215120612.
It is a super-2 number, since 2×2160215122 = 93330587293532288, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (216021511) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 443333 + ... + 443819.
It is an arithmetic number, because the mean of its divisors is an integer number (9773420).
Almost surely, 2216021512 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 216021512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234562080).
216021512 is an abundant number, since it is smaller than the sum of its proper divisors (253102648).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
216021512 is an equidigital number, since it uses as much as digits as its factorization.
216021512 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 678 (or 585 counting only the distinct ones).
The product of its (nonzero) digits is 240, while the sum is 20.
The square root of 216021512 is about 14697.6702915802.
The cubic root of 216021512 is about 600.0199178573.
The spelling of 216021512 in words is "two hundred sixteen million, twenty-one thousand, five hundred twelve".