1321221300210 has 256 divisors, whose sum is σ = 4045269012480. Its totient is φ = 300595276800.

The previous prime is 1321221300169. The next prime is 1321221300239. The reversal of 1321221300210 is 120031221231.

1321221300210 is a `hidden beast` number, since 1 + 32 + 122 + 1 + 300 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 414564237 + ... + 414567423.

It is an arithmetic number, because the mean of its divisors is an integer number (15801832080).

Almost surely, 2^{1321221300210} is an apocalyptic number.

1321221300210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321221300210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2022634506240).

1321221300210 is an abundant number, since it is smaller than the sum of its proper divisors (2724047712270).

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

1321221300210 is a wasteful number, since it uses less digits than its factorization.

1321221300210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158 (or 4152 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321221300210 its reverse (120031221231), we get a palindrome (1441252521441).

The spelling of 1321221300210 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred thousand, two hundred ten".