21012020201201 has 4 divisors (see below), whose sum is σ = 21068352695412. Its totient is φ = 20955687706992.

The previous prime is 21012020201189. The next prime is 21012020201213. The reversal of 21012020201201 is 10210202021012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21012020201189) and next prime (21012020201213).

It can be written as a sum of positive squares in 2 ways, for example, as 14471930031601 + 6540090169600 = 3804199^2 + 2557360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012020201201 - 2¹⁴ = 21012020184817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012020201101) 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, 28166246546 + ... + 28166247291.

It is an arithmetic number, because the mean of its divisors is an integer number (5267088173853).

Almost surely, 2^{21012020201201} is an apocalyptic number.

It is an amenable number.

21012020201201 is a deficient number, since it is larger than the sum of its proper divisors (56332494211).

21012020201201 is an equidigital number, since it uses as much as digits as its factorization.

21012020201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56332494210.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012020201201 its reverse (10210202021012), we get a palindrome (31222222222213).

The spelling of 21012020201201 in words is "twenty-one trillion, twelve billion, twenty million, two hundred one thousand, two hundred one".