1211200220120 has 64 divisors (see below), whose sum is σ = 2974825751040. Its totient is φ = 440157961600.

The previous prime is 1211200220081. The next prime is 1211200220173. The reversal of 1211200220120 is 210220021121.

It is a junction number, because it is equal to n+sod(n) for n = 1211200220095 and 1211200220104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172946 + ... + 1565985.

It is an arithmetic number, because the mean of its divisors is an integer number (46481652360).

Almost surely, 2^{1211200220120} is an apocalyptic number.

1211200220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211200220120 is an abundant number, since it is smaller than the sum of its proper divisors (1763625530920).

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

1211200220120 is a wasteful number, since it uses less digits than its factorization.

1211200220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740536 (or 1740532 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1211200220120 its reverse (210220021121), we get a palindrome (1421420241241).

The spelling of 1211200220120 in words is "one trillion, two hundred eleven billion, two hundred million, two hundred twenty thousand, one hundred twenty".