1211112100020 has 48 divisors (see below), whose sum is σ = 3482765612928. Its totient is φ = 314234490240.

The previous prime is 1211112100019. The next prime is 1211112100027. The reversal of 1211112100020 is 200012111121.

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 = 1211112099969 and 1211112100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211112100027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272770776 + ... + 272775215.

It is an arithmetic number, because the mean of its divisors is an integer number (72557616936).

Almost surely, 2^{1211112100020} is an apocalyptic number.

1211112100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211112100020 is an abundant number, since it is smaller than the sum of its proper divisors (2271653512908).

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

1211112100020 is a wasteful number, since it uses less digits than its factorization.

1211112100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545546040 (or 545546038 counting only the distinct ones).

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

Adding to 1211112100020 its reverse (200012111121), we get a palindrome (1411124211141).

The spelling of 1211112100020 in words is "one trillion, two hundred eleven billion, one hundred twelve million, one hundred thousand, twenty".