213320403421 has 4 divisors (see below), whose sum is σ = 213322112892. Its totient is φ = 213318693952.

The previous prime is 213320403367. The next prime is 213320403437. The reversal of 213320403421 is 124304023312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190893843396 + 22426560025 = 436914^2 + 149755^2 .

It is a cyclic number.

It is not a de Polignac number, because 213320403421 - 2¹⁷ = 213320272349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213324403421) 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, 651436 + ... + 922501.

It is an arithmetic number, because the mean of its divisors is an integer number (53330528223).

Almost surely, 2^213320403421 is an apocalyptic number.

It is an amenable number.

213320403421 is a deficient number, since it is larger than the sum of its proper divisors (1709471).

213320403421 is a wasteful number, since it uses less digits than its factorization.

213320403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709470.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 213320403421 its reverse (124304023312), we get a palindrome (337624426733).

The spelling of 213320403421 in words is "two hundred thirteen billion, three hundred twenty million, four hundred three thousand, four hundred twenty-one".