213402142203421 has 4 divisors (see below), whose sum is σ = 213597386616412. Its totient is φ = 213206897790432.

The previous prime is 213402142203391. The next prime is 213402142203427. The reversal of 213402142203421 is 124302241204312.

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 188938385376196 + 24463756827225 = 13745486^2 + 4946085^2 .

It is a cyclic number.

It is not a de Polignac number, because 213402142203421 - 2³⁵ = 213367782465053 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 (213402142203427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97622204856 + ... + 97622207041.

It is an arithmetic number, because the mean of its divisors is an integer number (53399346654103).

Almost surely, 2^{213402142203421} is an apocalyptic number.

It is an amenable number.

213402142203421 is a deficient number, since it is larger than the sum of its proper divisors (195244412991).

213402142203421 is a wasteful number, since it uses less digits than its factorization.

213402142203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195244412990.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 213402142203421 its reverse (124302241204312), we get a palindrome (337704383407733).

The spelling of 213402142203421 in words is "two hundred thirteen trillion, four hundred two billion, one hundred forty-two million, two hundred three thousand, four hundred twenty-one".