1321230231820 has 24 divisors (see below), whose sum is σ = 2774733144624. Its totient is φ = 528463586496.

The previous prime is 1321230231803. The next prime is 1321230231821. The reversal of 1321230231820 is 281320321231.

It is not an unprimeable number, because it can be changed into a prime (1321230231821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1399582 + ... + 2145061.

It is an arithmetic number, because the mean of its divisors is an integer number (115613881026).

Almost surely, 2^{1321230231820} is an apocalyptic number.

1321230231820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321230231820 is an abundant number, since it is smaller than the sum of its proper divisors (1453502912804).

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

1321230231820 is a wasteful number, since it uses less digits than its factorization.

1321230231820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563289 (or 3563287 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 1321230231820 in words is "one trillion, three hundred twenty-one billion, two hundred thirty million, two hundred thirty-one thousand, eight hundred twenty".