213212120321 has 16 divisors (see below), whose sum is σ = 222457071360. Its totient is φ = 204225390720.

The previous prime is 213212120267. The next prime is 213212120353. The reversal of 213212120321 is 123021212312.

It is a cyclic number.

It is not a de Polignac number, because 213212120321 - 2³⁰ = 212138378497 is a prime.

It is a super-2 number, since 2×213212120321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213212120293 and 213212120302.

It is not an unprimeable number, because it can be changed into a prime (213212129321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48746 + ... + 654828.

It is an arithmetic number, because the mean of its divisors is an integer number (13903566960).

Almost surely, 2^213212120321 is an apocalyptic number.

It is an amenable number.

213212120321 is a deficient number, since it is larger than the sum of its proper divisors (9244951039).

213212120321 is an equidigital number, since it uses as much as digits as its factorization.

213212120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606296.

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

Adding to 213212120321 its reverse (123021212312), we get a palindrome (336233332633).

The spelling of 213212120321 in words is "two hundred thirteen billion, two hundred twelve million, one hundred twenty thousand, three hundred twenty-one".