1021220100012 has 24 divisors (see below), whose sum is σ = 2723253600256. Its totient is φ = 291777171408.

The previous prime is 1021220099989. The next prime is 1021220100053. The reversal of 1021220100012 is 2100010221201.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6078690988 + ... + 6078691155.

Almost surely, 2^{1021220100012} is an apocalyptic number.

1021220100012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021220100012 is an abundant number, since it is smaller than the sum of its proper divisors (1702033500244).

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

1021220100012 is a wasteful number, since it uses less digits than its factorization.

1021220100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12157382157 (or 12157382155 counting only the distinct ones).

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

Adding to 1021220100012 its reverse (2100010221201), we get a palindrome (3121230321213).

The spelling of 1021220100012 in words is "one trillion, twenty-one billion, two hundred twenty million, one hundred thousand, twelve".