1021200120012 has 24 divisors (see below), whose sum is σ = 2418364465216. Its totient is φ = 335319442128.

The previous prime is 1021200120001. The next prime is 1021200120019. The reversal of 1021200120012 is 2100210021201.

It is a super-2 number, since 2×1021200120012² (a number of 25 digits) contains 22 as substring.

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

1021200120012 is a modest number, since divided by 120012 gives 10212 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1021200120012.

It is not an unprimeable number, because it can be changed into a prime (1021200120019) 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 7 ways as a sum of consecutive naturals, for example, 635073898 + ... + 635075505.

Almost surely, 2^{1021200120012} is an apocalyptic number.

1021200120012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021200120012 is an abundant number, since it is smaller than the sum of its proper divisors (1397164345204).

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

1021200120012 is a wasteful number, since it uses less digits than its factorization.

1021200120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270149477 (or 1270149475 counting only the distinct ones).

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

Adding to 1021200120012 its reverse (2100210021201), we get a palindrome (3121410141213).

The spelling of 1021200120012 in words is "one trillion, twenty-one billion, two hundred million, one hundred twenty thousand, twelve".