321000001220 has 48 divisors (see below), whose sum is σ = 691705744128. Its totient is φ = 125072424960.

The previous prime is 321000001199. The next prime is 321000001229. The reversal of 321000001220 is 22100000123.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (321000001229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610877 + ... + 1007556.

It is an arithmetic number, because the mean of its divisors is an integer number (14410536336).

Almost surely, 2^321000001220 is an apocalyptic number.

It is an amenable number.

321000001220 is an abundant number, since it is smaller than the sum of its proper divisors (370705742908).

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

321000001220 is a wasteful number, since it uses less digits than its factorization.

321000001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618700 (or 1618698 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 321000001220 its reverse (22100000123), we get a palindrome (343100001343).

The spelling of 321000001220 in words is "three hundred twenty-one billion, one thousand, two hundred twenty".