201211221011220 has 96 divisors (see below), whose sum is σ = 715417674720000. Its totient is φ = 45991136230272.

The previous prime is 201211221011197. The next prime is 201211221011257. The reversal of 201211221011220 is 22110122112102.

201211221011220 is a `hidden beast` number, since 2 + 0 + 1 + 211 + 221 + 0 + 11 + 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 = 201211221011193 and 201211221011202.

It is a congruent number.

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, 26615237095 + ... + 26615244654.

It is an arithmetic number, because the mean of its divisors is an integer number (7452267445000).

Almost surely, 2^{201211221011220} is an apocalyptic number.

201211221011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211221011220 is an abundant number, since it is smaller than the sum of its proper divisors (514206453708780).

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

201211221011220 is a wasteful number, since it uses less digits than its factorization.

201211221011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53230481774 (or 53230481766 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201211221011220 its reverse (22110122112102), we get a palindrome (223321343123322).

The spelling of 201211221011220 in words is "two hundred one trillion, two hundred eleven billion, two hundred twenty-one million, eleven thousand, two hundred twenty".