1211200111020 has 24 divisors (see below), whose sum is σ = 3391360311024. Its totient is φ = 322986696256.

The previous prime is 1211200110983. The next prime is 1211200111141. The reversal of 1211200111020 is 201110021121.

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 = 1211200110987 and 1211200111005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10093334199 + ... + 10093334318.

It is an arithmetic number, because the mean of its divisors is an integer number (141306679626).

Almost surely, 2^{1211200111020} is an apocalyptic number.

1211200111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211200111020 is an abundant number, since it is smaller than the sum of its proper divisors (2180160200004).

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

1211200111020 is a wasteful number, since it uses less digits than its factorization.

1211200111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20186668529 (or 20186668527 counting only the distinct ones).

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

Adding to 1211200111020 its reverse (201110021121), we get a palindrome (1412310132141).

The spelling of 1211200111020 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred eleven thousand, twenty".