213201310021 has 4 divisors (see below), whose sum is σ = 243658640032. Its totient is φ = 182743980012.

The previous prime is 213201310013. The next prime is 213201310081. The reversal of 213201310021 is 120013102312.

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 213201310021 - 2³ = 213201310013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213201309977 and 213201310004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213201310081) 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, 15228664995 + ... + 15228665008.

It is an arithmetic number, because the mean of its divisors is an integer number (60914660008).

Almost surely, 2^213201310021 is an apocalyptic number.

It is an amenable number.

213201310021 is a deficient number, since it is larger than the sum of its proper divisors (30457330011).

213201310021 is an equidigital number, since it uses as much as digits as its factorization.

213201310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30457330010.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 213201310021 its reverse (120013102312), we get a palindrome (333214412333).

The spelling of 213201310021 in words is "two hundred thirteen billion, two hundred one million, three hundred ten thousand, twenty-one".