21254233204201 has 4 divisors (see below), whose sum is σ = 21300337832004. Its totient is φ = 21208128576400.

The previous prime is 21254233204189. The next prime is 21254233204241. The reversal of 21254233204201 is 10240233245212.

It is a happy number.

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 10366371499225 + 10887861704976 = 3219685^2 + 3299676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254233204201 - 2²¹ = 21254231107049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254233204241) 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, 23052313210 + ... + 23052314131.

It is an arithmetic number, because the mean of its divisors is an integer number (5325084458001).

Almost surely, 2^{21254233204201} is an apocalyptic number.

It is an amenable number.

21254233204201 is a deficient number, since it is larger than the sum of its proper divisors (46104627803).

21254233204201 is an equidigital number, since it uses as much as digits as its factorization.

21254233204201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46104627802.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21254233204201 its reverse (10240233245212), we get a palindrome (31494466449413).

The spelling of 21254233204201 in words is "twenty-one trillion, two hundred fifty-four billion, two hundred thirty-three million, two hundred four thousand, two hundred one".