1211000110020 has 72 divisors (see below), whose sum is σ = 3733586165400. Its totient is φ = 317639370240.

The previous prime is 1211000109983. The next prime is 1211000110027. The reversal of 1211000110020 is 200110001121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17644871556 + 1193355238464 = 132834^2 + 1092408^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1211000109984 and 1211000110011.

It is not an unprimeable number, because it can be changed into a prime (1211000110027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55134745 + ... + 55156704.

Almost surely, 2^{1211000110020} is an apocalyptic number.

1211000110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211000110020 is an abundant number, since it is smaller than the sum of its proper divisors (2522586055380).

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

1211000110020 is a wasteful number, since it uses less digits than its factorization.

1211000110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110291525 (or 110291520 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211000110020 its reverse (200110001121), we get a palindrome (1411110111141).

The spelling of 1211000110020 in words is "one trillion, two hundred eleven billion, one hundred ten thousand, twenty".