1211020102120 has 32 divisors (see below), whose sum is σ = 2757624095520. Its totient is φ = 478571798080.

The previous prime is 1211020102079. The next prime is 1211020102121. The reversal of 1211020102120 is 212010201121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211020102120.

It is not an unprimeable number, because it can be changed into a prime (1211020102121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182379226 + ... + 182385865.

It is an arithmetic number, because the mean of its divisors is an integer number (86175752985).

Almost surely, 2^{1211020102120} is an apocalyptic number.

1211020102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211020102120 is an abundant number, since it is smaller than the sum of its proper divisors (1546603993400).

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

1211020102120 is a wasteful number, since it uses less digits than its factorization.

1211020102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364765185 (or 364765181 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211020102120 its reverse (212010201121), we get a palindrome (1423030303241).

Subtracting from 1211020102120 its reverse (212010201121), we obtain a palindrome (999009900999).

The spelling of 1211020102120 in words is "one trillion, two hundred eleven billion, twenty million, one hundred two thousand, one hundred twenty".