4240021212 has 144 divisors (see below), whose sum is σ = 12704852160. Its totient is φ = 1166570496.

The previous prime is 4240021211. The next prime is 4240021217. The reversal of 4240021212 is 2121200424.

4240021212 is a `hidden beast` number, since 42 + 400 + 212 + 12 = 666.

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 (4240021211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4947088 + ... + 4947944.

It is an arithmetic number, because the mean of its divisors is an integer number (88228140).

Almost surely, 2^4240021212 is an apocalyptic number.

4240021212 is a gapful number since it is divisible by the number (42) 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 4240021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6352426080).

4240021212 is an abundant number, since it is smaller than the sum of its proper divisors (8464830948).

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

4240021212 is a wasteful number, since it uses less digits than its factorization.

4240021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1575 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 4240021212 is about 65115.4452645453. The cubic root of 4240021212 is about 1618.5371659932.

Adding to 4240021212 its reverse (2121200424), we get a palindrome (6361221636).

The spelling of 4240021212 in words is "four billion, two hundred forty million, twenty-one thousand, two hundred twelve".