1200111021020 has 24 divisors (see below), whose sum is σ = 2538629012304. Its totient is φ = 476540433536.

The previous prime is 1200111021019. The next prime is 1200111021029. The reversal of 1200111021020 is 201201110021.

It is a junction number, because it is equal to n+sod(n) for n = 1200111020992 and 1200111021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111021029) 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, 218995622 + ... + 219001101.

It is an arithmetic number, because the mean of its divisors is an integer number (105776208846).

Almost surely, 2^{1200111021020} is an apocalyptic number.

1200111021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200111021020 is an abundant number, since it is smaller than the sum of its proper divisors (1338517991284).

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

1200111021020 is a wasteful number, since it uses less digits than its factorization.

1200111021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437996869 (or 437996867 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1200111021020 its reverse (201201110021), we get a palindrome (1401312131041).

The spelling of 1200111021020 in words is "one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, twenty".