1321203021102 has 64 divisors (see below), whose sum is σ = 2976503811840. Its totient is φ = 434362717728.

The previous prime is 1321203021097. The next prime is 1321203021113. The reversal of 1321203021102 is 2011203021231.

1321203021102 is a `hidden beast` number, since 132 + 120 + 302 + 110 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 807948 + ... + 1815264.

It is an arithmetic number, because the mean of its divisors is an integer number (46507872060).

Almost surely, 2^{1321203021102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321203021102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488251905920).

1321203021102 is an abundant number, since it is smaller than the sum of its proper divisors (1655300790738).

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

1321203021102 is a wasteful number, since it uses less digits than its factorization.

1321203021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007662 (or 1007656 counting only the distinct ones).

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

Adding to 1321203021102 its reverse (2011203021231), we get a palindrome (3332406042333).

The spelling of 1321203021102 in words is "one trillion, three hundred twenty-one billion, two hundred three million, twenty-one thousand, one hundred two".