212121030024 has 48 divisors (see below), whose sum is σ = 578879935920. Its totient is φ = 70167258720.

The previous prime is 212121030013. The next prime is 212121030029. The reversal of 212121030024 is 420030121212.

It is a happy number.

It is a super-3 number, since 3×212121030024³ (a number of 35 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 212121029979 and 212121030006.

It is not an unprimeable number, because it can be changed into a prime (212121030029) 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, 11235322 + ... + 11254185.

It is an arithmetic number, because the mean of its divisors is an integer number (12059998665).

Almost surely, 2^212121030024 is an apocalyptic number.

212121030024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212121030024 is an abundant number, since it is smaller than the sum of its proper divisors (366758905896).

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

212121030024 is a wasteful number, since it uses less digits than its factorization.

212121030024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22489650 (or 22489643 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 212121030024 its reverse (420030121212), we get a palindrome (632151151236).

The spelling of 212121030024 in words is "two hundred twelve billion, one hundred twenty-one million, thirty thousand, twenty-four".