213121321201 has 4 divisors (see below), whose sum is σ = 213125154304. Its totient is φ = 213117488100.

The previous prime is 213121321129. The next prime is 213121321241. The reversal of 213121321201 is 102123121312.

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 not a de Polignac number, because 213121321201 - 2⁷ = 213121321073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213121321241) 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, 1831905 + ... + 1944766.

It is an arithmetic number, because the mean of its divisors is an integer number (53281288576).

Almost surely, 2^213121321201 is an apocalyptic number.

It is an amenable number.

213121321201 is a deficient number, since it is larger than the sum of its proper divisors (3833103).

213121321201 is an equidigital number, since it uses as much as digits as its factorization.

213121321201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833102.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213121321201 its reverse (102123121312), we get a palindrome (315244442513).

The spelling of 213121321201 in words is "two hundred thirteen billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred one".