212001100221220 has 24 divisors (see below), whose sum is σ = 445217923483704. Its totient is φ = 84797466180096.

The previous prime is 212001100221187. The next prime is 212001100221241. The reversal of 212001100221220 is 22122001100212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29045610802404 + 182955489418816 = 5389398^2 + 13526104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212001100221194 and 212001100221203.

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, 185284677 + ... + 186425356.

It is an arithmetic number, because the mean of its divisors is an integer number (18550746811821).

Almost surely, 2^{212001100221220} is an apocalyptic number.

212001100221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212001100221220 is an abundant number, since it is smaller than the sum of its proper divisors (233216823262484).

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

212001100221220 is a wasteful number, since it uses less digits than its factorization.

212001100221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371738559 (or 371738557 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212001100221220 its reverse (22122001100212), we get a palindrome (234123101321432).

The spelling of 212001100221220 in words is "two hundred twelve trillion, one billion, one hundred million, two hundred twenty-one thousand, two hundred twenty".