1212221021020 has 48 divisors (see below), whose sum is σ = 2590406074368. Its totient is φ = 476403935040.

The previous prime is 1212221021017. The next prime is 1212221021021. The reversal of 1212221021020 is 201201222121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1212221020985 and 1212221021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221021021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 667776 + ... + 1694215.

It is an arithmetic number, because the mean of its divisors is an integer number (53966793216).

Almost surely, 2^{1212221021020} is an apocalyptic number.

1212221021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221021020 is an abundant number, since it is smaller than the sum of its proper divisors (1378185053348).

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

1212221021020 is a wasteful number, since it uses less digits than its factorization.

1212221021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362450 (or 2362448 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212221021020 its reverse (201201222121), we get a palindrome (1413422243141).

The spelling of 1212221021020 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, twenty".