321205100420 has 12 divisors (see below), whose sum is σ = 674530710924. Its totient is φ = 128482040160.

The previous prime is 321205100401. The next prime is 321205100423. The reversal of 321205100420 is 24001502123.

It can be written as a sum of positive squares in 2 ways, for example, as 35790585856 + 285414514564 = 189184^2 + 534242^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 16060255021 = 321205100420 / (3 + 2 + 1 + 2 + 0 + 5 + 1 + 0 + 0 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 321205100392 and 321205100401.

It is not an unprimeable number, because it can be changed into a prime (321205100423) 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, 8030127491 + ... + 8030127530.

It is an arithmetic number, because the mean of its divisors is an integer number (56210892577).

Almost surely, 2^321205100420 is an apocalyptic number.

It is an amenable number.

321205100420 is an abundant number, since it is smaller than the sum of its proper divisors (353325610504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321205100420 is a wasteful number, since it uses less digits than its factorization.

321205100420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16060255030 (or 16060255028 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 321205100420 its reverse (24001502123), we get a palindrome (345206602543).

The spelling of 321205100420 in words is "three hundred twenty-one billion, two hundred five million, one hundred thousand, four hundred twenty".