21201012000021 has 8 divisors (see below), whose sum is σ = 32306304000064. Its totient is φ = 12114864000000.

The previous prime is 21201012000013. The next prime is 21201012000067. The reversal of 21201012000021 is 12000021010212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201012000021 - 2³ = 21201012000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201011999970 and 21201012000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201012000011) 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, 504785999980 + ... + 504786000021.

It is an arithmetic number, because the mean of its divisors is an integer number (4038288000008).

Almost surely, 2^{21201012000021} is an apocalyptic number.

21201012000021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21201012000021 is a deficient number, since it is larger than the sum of its proper divisors (11105292000043).

21201012000021 is a wasteful number, since it uses less digits than its factorization.

21201012000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009572000011.

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

Adding to 21201012000021 its reverse (12000021010212), we get a palindrome (33201033010233).

The spelling of 21201012000021 in words is "twenty-one trillion, two hundred one billion, twelve million, twenty-one", and thus it is an aban number.