21012300000001 has 4 divisors (see below), whose sum is σ = 21015709433392. Its totient is φ = 21008890566612.

The previous prime is 21012299999989. The next prime is 21012300000007. The reversal of 21012300000001 is 10000000321012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012300000001 - 2³⁹ = 20462544186113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012300000007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704707451 + ... + 1704719776.

It is an arithmetic number, because the mean of its divisors is an integer number (5253927358348).

Almost surely, 2^{21012300000001} is an apocalyptic number.

It is an amenable number.

21012300000001 is a deficient number, since it is larger than the sum of its proper divisors (3409433391).

21012300000001 is an equidigital number, since it uses as much as digits as its factorization.

21012300000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409433390.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21012300000001 its reverse (10000000321012), we get a palindrome (31012300321013).

The spelling of 21012300000001 in words is "twenty-one trillion, twelve billion, three hundred million, one", and thus it is an aban number.