1321021222120 has 64 divisors (see below), whose sum is σ = 3006017211600. Its totient is φ = 522415196160.

The previous prime is 1321021222097. The next prime is 1321021222127. The reversal of 1321021222120 is 212221201231.

It can be written as a sum of positive squares in 8 ways, for example, as 320417130916 + 1000604091204 = 566054^2 + 1000302^2 .

It is not an unprimeable number, because it can be changed into a prime (1321021222127) 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, 52750242 + ... + 52775278.

Almost surely, 2^{1321021222120} is an apocalyptic number.

1321021222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321021222120 is an abundant number, since it is smaller than the sum of its proper divisors (1684995989480).

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

1321021222120 is a wasteful number, since it uses less digits than its factorization.

1321021222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39958 (or 39954 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1321021222120 its reverse (212221201231), we get a palindrome (1533242423351).

The spelling of 1321021222120 in words is "one trillion, three hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty".