201021212201220 has 72 divisors (see below), whose sum is σ = 609888005737920. Its totient is φ = 53594785197120.

The previous prime is 201021212201203. The next prime is 201021212201267. The reversal of 201021212201220 is 22102212120102.

It is a happy number.

201021212201220 is a `hidden beast` number, since 2 + 0 + 10 + 21 + 212 + 201 + 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 = 201021212201193 and 201021212201202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112353600 + ... + 114128759.

It is an arithmetic number, because the mean of its divisors is an integer number (8470666746360).

Almost surely, 2^{201021212201220} is an apocalyptic number.

201021212201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021212201220 is an abundant number, since it is smaller than the sum of its proper divisors (408866793536700).

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

201021212201220 is a wasteful number, since it uses less digits than its factorization.

201021212201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226487305 (or 226487300 counting only the distinct ones).

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

Adding to 201021212201220 its reverse (22102212120102), we get a palindrome (223123424321322).

The spelling of 201021212201220 in words is "two hundred one trillion, twenty-one billion, two hundred twelve million, two hundred one thousand, two hundred twenty".