21012021201201 has 4 divisors (see below), whose sum is σ = 28016028268272. Its totient is φ = 14008014134132.

The previous prime is 21012021201191. The next prime is 21012021201229. The reversal of 21012021201201 is 10210212021012.

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 a de Polignac number, because none of the positive numbers 2^k-21012021201201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012021201001) 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, 3502003533531 + ... + 3502003533536.

It is an arithmetic number, because the mean of its divisors is an integer number (7004007067068).

Almost surely, 2^{21012021201201} is an apocalyptic number.

It is an amenable number.

21012021201201 is a deficient number, since it is larger than the sum of its proper divisors (7004007067071).

21012021201201 is an equidigital number, since it uses as much as digits as its factorization.

21012021201201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004007067070.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012021201201 its reverse (10210212021012), we get a palindrome (31222233222213).

The spelling of 21012021201201 in words is "twenty-one trillion, twelve billion, twenty-one million, two hundred one thousand, two hundred one".