210001111211220 has 96 divisors (see below), whose sum is σ = 701221101815808. Its totient is φ = 45913286424192.

The previous prime is 210001111211189. The next prime is 210001111211237. The reversal of 210001111211220 is 22112111100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 210001111211220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10869613074 + ... + 10869632393.

It is an arithmetic number, because the mean of its divisors is an integer number (7304386477248).

Almost surely, 2^{210001111211220} is an apocalyptic number.

210001111211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001111211220 is an abundant number, since it is smaller than the sum of its proper divisors (491219990604588).

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

210001111211220 is a wasteful number, since it uses less digits than its factorization.

210001111211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21739245509 (or 21739245507 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210001111211220 its reverse (22112111100012), we get a palindrome (232113222311232).

The spelling of 210001111211220 in words is "two hundred ten trillion, one billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty".