210001111220 has 24 divisors (see below), whose sum is σ = 445283913984. Its totient is φ = 83184905376.

The previous prime is 210001111207. The next prime is 210001111247. The reversal of 210001111220 is 22111100012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50969084 + ... + 50973203.

It is an arithmetic number, because the mean of its divisors is an integer number (18553496416).

Almost surely, 2^210001111220 is an apocalyptic number.

210001111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001111220 is an abundant number, since it is smaller than the sum of its proper divisors (235282802764).

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

210001111220 is a wasteful number, since it uses less digits than its factorization.

210001111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101942399 (or 101942397 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210001111220 its reverse (22111100012), we get a palindrome (232112211232).

The spelling of 210001111220 in words is "two hundred ten billion, one million, one hundred eleven thousand, two hundred twenty".