216021510 has 48 divisors (see below), whose sum is σ = 563060160.
Its totient is φ = 57461760.
The previous prime is 216021473. The next prime is 216021511. The reversal of 216021510 is 15120612.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (216021511) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36006 + ... + 41574.
It is an arithmetic number, because the mean of its divisors is an integer number (11730420).
Almost surely, 2216021510 is an apocalyptic number.
216021510 is an abundant number, since it is smaller than the sum of its proper divisors (347038650).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
216021510 is a wasteful number, since it uses less digits than its factorization.
216021510 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6013 (or 6010 counting only the distinct ones).
The product of its (nonzero) digits is 120, while the sum is 18.
The square root of 216021510 is about 14697.6702235422.
The cubic root of 216021510 is about 600.0199160056.
The spelling of 216021510 in words is "two hundred sixteen million, twenty-one thousand, five hundred ten".