21012321320201 has 4 divisors (see below), whose sum is σ = 21012470962500. Its totient is φ = 21012171677904.

The previous prime is 21012321320183. The next prime is 21012321320267. The reversal of 21012321320201 is 10202312321012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7567808431225 + 13444512888976 = 2750965^2 + 3666676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012321320201 - 2²² = 21012317125897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012321320101) 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, 74610326 + ... + 74891423.

It is an arithmetic number, because the mean of its divisors is an integer number (5253117740625).

Almost surely, 2^{21012321320201} is an apocalyptic number.

It is an amenable number.

21012321320201 is a deficient number, since it is larger than the sum of its proper divisors (149642299).

21012321320201 is a wasteful number, since it uses less digits than its factorization.

21012321320201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149642298.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21012321320201 its reverse (10202312321012), we get a palindrome (31214633641213).

The spelling of 21012321320201 in words is "twenty-one trillion, twelve billion, three hundred twenty-one million, three hundred twenty thousand, two hundred one".