201212210021220 has 192 divisors, whose sum is σ = 642555303828480. Its totient is φ = 52254427968000.

The previous prime is 201212210021219. The next prime is 201212210021261. The reversal of 201212210021220 is 22120012212102.

It is a happy number.

201212210021220 is a `hidden beast` number, since 2 + 0 + 1 + 212 + 210 + 0 + 21 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201212210021193 and 201212210021202.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26912892 + ... + 33566771.

It is an arithmetic number, because the mean of its divisors is an integer number (3346642207440).

Almost surely, 2^{201212210021220} is an apocalyptic number.

201212210021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212210021220 is an abundant number, since it is smaller than the sum of its proper divisors (441343093807260).

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

201212210021220 is a wasteful number, since it uses less digits than its factorization.

201212210021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60479843 (or 60479835 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201212210021220 its reverse (22120012212102), we get a palindrome (223332222233322).

The spelling of 201212210021220 in words is "two hundred one trillion, two hundred twelve billion, two hundred ten million, twenty-one thousand, two hundred twenty".