1321231021002 has 48 divisors (see below), whose sum is σ = 2929402476000. Its totient is φ = 430144507296.

The previous prime is 1321231020929. The next prime is 1321231021007. The reversal of 1321231021002 is 2001201321231.

1321231021002 is a `hidden beast` number, since 132 + 12 + 310 + 210 + 0 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1321231021007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18927388 + ... + 18997064.

It is an arithmetic number, because the mean of its divisors is an integer number (61029218250).

Almost surely, 2^{1321231021002} is an apocalyptic number.

1321231021002 is an abundant number, since it is smaller than the sum of its proper divisors (1608171454998).

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

1321231021002 is a wasteful number, since it uses less digits than its factorization.

1321231021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94227 (or 94224 counting only the distinct ones).

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

Adding to 1321231021002 its reverse (2001201321231), we get a palindrome (3322432342233).

The spelling of 1321231021002 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, twenty-one thousand, two".