1220021001012 has 48 divisors (see below), whose sum is σ = 3288184949952. Its totient is φ = 347956078080.

The previous prime is 1220021001007. The next prime is 1220021001013. The reversal of 1220021001012 is 2101001200221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021001013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271838443 + ... + 271842930.

It is an arithmetic number, because the mean of its divisors is an integer number (68503853124).

Almost surely, 2^{1220021001012} is an apocalyptic number.

1220021001012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220021001012 is an abundant number, since it is smaller than the sum of its proper divisors (2068163948940).

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

1220021001012 is a wasteful number, since it uses less digits than its factorization.

1220021001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543681408 (or 543681406 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1220021001012 its reverse (2101001200221), we get a palindrome (3321022201233).

The spelling of 1220021001012 in words is "one trillion, two hundred twenty billion, twenty-one million, one thousand, twelve".