1211111020000 has 120 divisors (see below), whose sum is σ = 3405160137456. Its totient is φ = 415238016000.

The previous prime is 1211111019947. The next prime is 1211111020081. The reversal of 1211111020000 is 201111121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4185397 + ... + 4465396.

Almost surely, 2^{1211111020000} is an apocalyptic number.

1211111020000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111020000 is an abundant number, since it is smaller than the sum of its proper divisors (2194049117456).

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

1211111020000 is an frugal number, since it uses more digits than its factorization.

1211111020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8650830 (or 8650807 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1211111020000 its reverse (201111121), we get a palindrome (1211312131121).

The spelling of 1211111020000 in words is "one trillion, two hundred eleven billion, one hundred eleven million, twenty thousand".