1321320012210 has 64 divisors (see below), whose sum is σ = 3843840044160. Its totient is φ = 320320002240.

The previous prime is 1321320012179. The next prime is 1321320012239. The reversal of 1321320012210 is 122100231231.

1321320012210 is a `hidden beast` number, since 1 + 321 + 320 + 0 + 1 + 2 + 21 + 0 = 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 31 ways as a sum of consecutive naturals, for example, 222441477 + ... + 222447416.

It is an arithmetic number, because the mean of its divisors is an integer number (60060000690).

Almost surely, 2^{1321320012210} is an apocalyptic number.

1321320012210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321320012210 is an abundant number, since it is smaller than the sum of its proper divisors (2522520031950).

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

1321320012210 is a wasteful number, since it uses less digits than its factorization.

1321320012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444888920 (or 444888914 counting only the distinct ones).

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

Adding to 1321320012210 its reverse (122100231231), we get a palindrome (1443420243441).

The spelling of 1321320012210 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, twelve thousand, two hundred ten".