1222121200020 has 144 divisors (see below), whose sum is σ = 3981590867520. Its totient is φ = 279274093056.

The previous prime is 1222121199991. The next prime is 1222121200039. The reversal of 1222121200020 is 200021212221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 12584811 + ... + 12681549.

It is an arithmetic number, because the mean of its divisors is an integer number (27649936580).

Almost surely, 2^{1222121200020} is an apocalyptic number.

1222121200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222121200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1990795433760).

1222121200020 is an abundant number, since it is smaller than the sum of its proper divisors (2759469667500).

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

1222121200020 is a wasteful number, since it uses less digits than its factorization.

1222121200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101062 (or 101053 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1222121200020 its reverse (200021212221), we get a palindrome (1422142412241).

It can be divided in two parts, 1222121 and 200020, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 1222121200020 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, twenty".