1212211110020 has 24 divisors (see below), whose sum is σ = 2545698533784. Its totient is φ = 484873929216.

The previous prime is 1212211110007. The next prime is 1212211110023. The reversal of 1212211110020 is 200111122121.

It can be written as a sum of positive squares in 4 ways, for example, as 77338497604 + 1134872612416 = 278098^2 + 1065304^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1212211109977 and 1212211110004.

It is not an unprimeable number, because it can be changed into a prime (1212211110023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323894 + ... + 1590386.

It is an arithmetic number, because the mean of its divisors is an integer number (106070772241).

Almost surely, 2^{1212211110020} is an apocalyptic number.

1212211110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212211110020 is an abundant number, since it is smaller than the sum of its proper divisors (1333487423764).

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

1212211110020 is a wasteful number, since it uses less digits than its factorization.

1212211110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314359 (or 1314357 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212211110020 its reverse (200111122121), we get a palindrome (1412322232141).

It can be divided in two parts, 1212211 and 110020, that added together give a palindrome (1322231).

The spelling of 1212211110020 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred ten thousand, twenty".