1211000220120 has 64 divisors (see below), whose sum is σ = 3758276556000. Its totient is φ = 311797756928.

The previous prime is 1211000220119. The next prime is 1211000220127. The reversal of 1211000220120 is 210220001121.

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 = 1211000220096 and 1211000220105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000220127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173990805 + ... + 173997764.

Almost surely, 2^{1211000220120} is an apocalyptic number.

1211000220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211000220120 is an abundant number, since it is smaller than the sum of its proper divisors (2547276335880).

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

1211000220120 is a wasteful number, since it uses less digits than its factorization.

1211000220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347988612 (or 347988608 counting only the distinct ones).

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

Adding to 1211000220120 its reverse (210220001121), we get a palindrome (1421220221241).

The spelling of 1211000220120 in words is "one trillion, two hundred eleven billion, two hundred twenty thousand, one hundred twenty".