201212210220 has 96 divisors (see below), whose sum is σ = 649786368000. Its totient is φ = 45569412864.

The previous prime is 201212210219. The next prime is 201212210263. The reversal of 201212210220 is 22012212102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201212210220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2151820 + ... + 2243379.

It is an arithmetic number, because the mean of its divisors is an integer number (6768608000).

Almost surely, 2^201212210220 is an apocalyptic number.

201212210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212210220 is an abundant number, since it is smaller than the sum of its proper divisors (448574157780).

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

201212210220 is a wasteful number, since it uses less digits than its factorization.

201212210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395327 (or 4395325 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 201212210220 its reverse (22012212102), we get a palindrome (223224422322).

The spelling of 201212210220 in words is "two hundred one billion, two hundred twelve million, two hundred ten thousand, two hundred twenty".