213421234549 has 2 divisors, whose sum is σ = 213421234550. Its totient is φ = 213421234548.

The previous prime is 213421234529. The next prime is 213421234627. The reversal of 213421234549 is 945432124312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133681640625 + 79739593924 = 365625^2 + 282382^2 .

It is a cyclic number.

It is not a de Polignac number, because 213421234549 - 2⁵ = 213421234517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213421234529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106710617274 + 106710617275.

It is an arithmetic number, because the mean of its divisors is an integer number (106710617275).

Almost surely, 2^213421234549 is an apocalyptic number.

It is an amenable number.

213421234549 is a deficient number, since it is larger than the sum of its proper divisors (1).

213421234549 is an equidigital number, since it uses as much as digits as its factorization.

213421234549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 40.

The spelling of 213421234549 in words is "two hundred thirteen billion, four hundred twenty-one million, two hundred thirty-four thousand, five hundred forty-nine".