1200012010021 has 16 divisors (see below), whose sum is σ = 1345896972288. Its totient is φ = 1060499689200.

The previous prime is 1200012010003. The next prime is 1200012010033. The reversal of 1200012010021 is 1200102100021.

It is a cyclic number.

It is not a de Polignac number, because 1200012010021 - 2²⁷ = 1199877792293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012010081) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5912101 + ... + 6111706.

It is an arithmetic number, because the mean of its divisors is an integer number (84118560768).

Almost surely, 2^{1200012010021} is an apocalyptic number.

1200012010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200012010021 is a deficient number, since it is larger than the sum of its proper divisors (145884962267).

1200012010021 is a wasteful number, since it uses less digits than its factorization.

1200012010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12024072.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200012010021 its reverse (1200102100021), we get a palindrome (2400114110042).

It can be divided in two parts, 12000 and 12010021, that added together give a palindrome (12022021).

The spelling of 1200012010021 in words is "one trillion, two hundred billion, twelve million, ten thousand, twenty-one".