201100211220 has 48 divisors (see below), whose sum is σ = 563101781760. Its totient is φ = 53624704896.

The previous prime is 201100211219. The next prime is 201100211243. The reversal of 201100211220 is 22112001102.

It is a super-2 number, since 2×201100211220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 201100211196 and 201100211205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2239141 + ... + 2327219.

It is an arithmetic number, because the mean of its divisors is an integer number (11731287120).

Almost surely, 2^201100211220 is an apocalyptic number.

201100211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201100211220 is an abundant number, since it is smaller than the sum of its proper divisors (362001570540).

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

201100211220 is a wasteful number, since it uses less digits than its factorization.

201100211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126144 (or 126142 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201100211220 its reverse (22112001102), we get a palindrome (223212212322).

The spelling of 201100211220 in words is "two hundred one billion, one hundred million, two hundred eleven thousand, two hundred twenty".