21223201133201 has 4 divisors (see below), whose sum is σ = 21254736351012. Its totient is φ = 21191665915392.

The previous prime is 21223201133171. The next prime is 21223201133203. The reversal of 21223201133201 is 10233110232212.

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 3298782225025 + 17924418908176 = 1816255^2 + 4233724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223201133201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223201133203) 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, 15767607896 + ... + 15767609241.

It is an arithmetic number, because the mean of its divisors is an integer number (5313684087753).

Almost surely, 2^{21223201133201} is an apocalyptic number.

It is an amenable number.

21223201133201 is a deficient number, since it is larger than the sum of its proper divisors (31535217811).

21223201133201 is an equidigital number, since it uses as much as digits as its factorization.

21223201133201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31535217810.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21223201133201 its reverse (10233110232212), we get a palindrome (31456311365413).

The spelling of 21223201133201 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred one million, one hundred thirty-three thousand, two hundred one".