1211011110020 has 12 divisors (see below), whose sum is σ = 2543123331084. Its totient is φ = 484404444000.

The previous prime is 1211011110013. The next prime is 1211011110041. The reversal of 1211011110020 is 200111101121.

It can be written as a sum of positive squares in 2 ways, for example, as 260869648516 + 950141461504 = 510754^2 + 974752^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211011109983 and 1211011110010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30275277731 + ... + 30275277770.

It is an arithmetic number, because the mean of its divisors is an integer number (211926944257).

Almost surely, 2^{1211011110020} is an apocalyptic number.

1211011110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211011110020 is an abundant number, since it is smaller than the sum of its proper divisors (1332112221064).

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

1211011110020 is a wasteful number, since it uses less digits than its factorization.

1211011110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60550555510 (or 60550555508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1211011110020 its reverse (200111101121), we get a palindrome (1411122211141).

The spelling of 1211011110020 in words is "one trillion, two hundred eleven billion, eleven million, one hundred ten thousand, twenty".