204213243201421 has 4 divisors (see below), whose sum is σ = 204213422831644. Its totient is φ = 204213063571200.

The previous prime is 204213243201419. The next prime is 204213243201463. The reversal of 204213243201421 is 124102342312402.

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 31275094347396 + 172938148854025 = 5592414^2 + 13150595^2 .

It is a cyclic number.

It is not a de Polignac number, because 204213243201421 - 2¹ = 204213243201419 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 (204213243201491) 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, 88098900 + ... + 90387181.

It is an arithmetic number, because the mean of its divisors is an integer number (51053355707911).

Almost surely, 2^{204213243201421} is an apocalyptic number.

It is an amenable number.

204213243201421 is a deficient number, since it is larger than the sum of its proper divisors (179630223).

204213243201421 is a wasteful number, since it uses less digits than its factorization.

204213243201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179630222.

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

Adding to 204213243201421 its reverse (124102342312402), we get a palindrome (328315585513823).

The spelling of 204213243201421 in words is "two hundred four trillion, two hundred thirteen billion, two hundred forty-three million, two hundred one thousand, four hundred twenty-one".