1210111100220 has 96 divisors (see below), whose sum is σ = 3725444653056. Its totient is φ = 291050323200.

The previous prime is 1210111100201. The next prime is 1210111100239. The reversal of 1210111100220 is 220011110121.

It is an interprime number because it is at equal distance from previous prime (1210111100201) and next prime (1210111100239).

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 = 1210111100196 and 1210111100205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7134691 + ... + 7302330.

It is an arithmetic number, because the mean of its divisors is an integer number (38806715136).

Almost surely, 2^{1210111100220} is an apocalyptic number.

1210111100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210111100220 is an abundant number, since it is smaller than the sum of its proper divisors (2515333552836).

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

1210111100220 is a wasteful number, since it uses less digits than its factorization.

1210111100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14437171 (or 14437169 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1210111100220 its reverse (220011110121), we get a palindrome (1430122210341).

Subtracting from 1210111100220 its reverse (220011110121), we obtain a palindrome (990099990099).

The spelling of 1210111100220 in words is "one trillion, two hundred ten billion, one hundred eleven million, one hundred thousand, two hundred twenty".