213321213461 has 2 divisors, whose sum is σ = 213321213462. Its totient is φ = 213321213460.

The previous prime is 213321213401. The next prime is 213321213473. The reversal of 213321213461 is 164312123312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153311402500 + 60009810961 = 391550^2 + 244969^2 .

It is a cyclic number.

It is not a de Polignac number, because 213321213461 - 2⁶ = 213321213397 is a prime.

It is a super-2 number, since 2×213321213461² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213321213401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106660606730 + 106660606731.

It is an arithmetic number, because the mean of its divisors is an integer number (106660606731).

Almost surely, 2^213321213461 is an apocalyptic number.

It is an amenable number.

213321213461 is a deficient number, since it is larger than the sum of its proper divisors (1).

213321213461 is an equidigital number, since it uses as much as digits as its factorization.

213321213461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

Adding to 213321213461 its reverse (164312123312), we get a palindrome (377633336773).

The spelling of 213321213461 in words is "two hundred thirteen billion, three hundred twenty-one million, two hundred thirteen thousand, four hundred sixty-one".