212403351220 has 24 divisors (see below), whose sum is σ = 446056141608. Its totient is φ = 84959606400.

The previous prime is 212403351161. The next prime is 212403351247. The reversal of 212403351220 is 22153304212.

It can be written as a sum of positive squares in 4 ways, for example, as 48768538896 + 163634812324 = 220836^2 + 404518^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1425450 + ... + 1567390.

It is an arithmetic number, because the mean of its divisors is an integer number (18585672567).

Almost surely, 2^212403351220 is an apocalyptic number.

212403351220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212403351220 is an abundant number, since it is smaller than the sum of its proper divisors (233652790388).

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

212403351220 is a wasteful number, since it uses less digits than its factorization.

212403351220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216771 (or 216769 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 212403351220 its reverse (22153304212), we get a palindrome (234556655432).

The spelling of 212403351220 in words is "two hundred twelve billion, four hundred three million, three hundred fifty-one thousand, two hundred twenty".