212201242420 has 24 divisors (see below), whose sum is σ = 447568569000. Its totient is φ = 84509837952.

The previous prime is 212201242361. The next prime is 212201242423. The reversal of 212201242420 is 24242102212.

It can be written as a sum of positive squares in 4 ways, for example, as 102863884176 + 109337358244 = 320724^2 + 330662^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212201242391 and 212201242400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201242423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23161495 + ... + 23170654.

It is an arithmetic number, because the mean of its divisors is an integer number (18648690375).

Almost surely, 2^212201242420 is an apocalyptic number.

212201242420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212201242420 is an abundant number, since it is smaller than the sum of its proper divisors (235367326580).

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

212201242420 is a wasteful number, since it uses less digits than its factorization.

212201242420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46332387 (or 46332385 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 212201242420 its reverse (24242102212), we get a palindrome (236443344632).

The spelling of 212201242420 in words is "two hundred twelve billion, two hundred one million, two hundred forty-two thousand, four hundred twenty".