212521103420 has 48 divisors (see below), whose sum is σ = 456667061760. Its totient is φ = 83046452736.

The previous prime is 212521103413. The next prime is 212521103429. The reversal of 212521103420 is 24301125212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212521103429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183260 + ... + 677219.

It is an arithmetic number, because the mean of its divisors is an integer number (9513897120).

Almost surely, 2^212521103420 is an apocalyptic number.

212521103420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212521103420 is an abundant number, since it is smaller than the sum of its proper divisors (244145958340).

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

212521103420 is a wasteful number, since it uses less digits than its factorization.

212521103420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860774 (or 860772 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 212521103420 its reverse (24301125212), we get a palindrome (236822228632).

The spelling of 212521103420 in words is "two hundred twelve billion, five hundred twenty-one million, one hundred three thousand, four hundred twenty".