1321102013020 has 24 divisors (see below), whose sum is σ = 2774972292624. Its totient is φ = 528315459456.

The previous prime is 1321102013003. The next prime is 1321102013069. The reversal of 1321102013020 is 203102011231.

It is a junction number, because it is equal to n+sod(n) for n = 1321102012985 and 1321102013003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7747662 + ... + 7916341.

It is an arithmetic number, because the mean of its divisors is an integer number (115623845526).

Almost surely, 2^{1321102013020} is an apocalyptic number.

1321102013020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321102013020 is an abundant number, since it is smaller than the sum of its proper divisors (1453870279604).

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

1321102013020 is a wasteful number, since it uses less digits than its factorization.

1321102013020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15668229 (or 15668227 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1321102013020 its reverse (203102011231), we get a palindrome (1524204024251).

The spelling of 1321102013020 in words is "one trillion, three hundred twenty-one billion, one hundred two million, thirteen thousand, twenty".