4212121520 has 20 divisors (see below), whose sum is σ = 9793182720. Its totient is φ = 1684848576.

The previous prime is 4212121517. The next prime is 4212121531. The reversal of 4212121520 is 251212124.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×4212121520² = 35483935398494220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4212121492 and 4212121501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26325680 + ... + 26325839.

It is an arithmetic number, because the mean of its divisors is an integer number (489659136).

Almost surely, 2^4212121520 is an apocalyptic number.

4212121520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4212121520 is an abundant number, since it is smaller than the sum of its proper divisors (5581061200).

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

4212121520 is a wasteful number, since it uses less digits than its factorization.

4212121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52651532 (or 52651526 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 4212121520 is about 64900.8591622638. The cubic root of 4212121520 is about 1614.9793145309.

Adding to 4212121520 its reverse (251212124), we get a palindrome (4463333644).

The spelling of 4212121520 in words is "four billion, two hundred twelve million, one hundred twenty-one thousand, five hundred twenty".