1220020100012 has 72 divisors (see below), whose sum is σ = 2630141421264. Its totient is φ = 492027691008.

The previous prime is 1220020099999. The next prime is 1220020100017. The reversal of 1220020100012 is 2100010200221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020099966 and 1220020100002.

It is not an unprimeable number, because it can be changed into a prime (1220020100017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22720748 + ... + 22774380.

It is an arithmetic number, because the mean of its divisors is an integer number (36529741962).

Almost surely, 2^{1220020100012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220020100012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315070710632).

1220020100012 is an abundant number, since it is smaller than the sum of its proper divisors (1410121321252).

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

1220020100012 is a wasteful number, since it uses less digits than its factorization.

1220020100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60495 (or 60486 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220020100012 its reverse (2100010200221), we get a palindrome (3320030300233).

The spelling of 1220020100012 in words is "one trillion, two hundred twenty billion, twenty million, one hundred thousand, twelve".