1321023301020 has 72 divisors (see below), whose sum is σ = 4115404142304. Its totient is φ = 342751989888.

The previous prime is 1321023301007. The next prime is 1321023301069. The reversal of 1321023301020 is 201033201231.

1321023301020 is a `hidden beast` number, since 1 + 321 + 0 + 2 + 330 + 10 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1321023300984 and 1321023301002.

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 23 ways as a sum of consecutive naturals, for example, 99169264 + ... + 99182583.

Almost surely, 2^{1321023301020} is an apocalyptic number.

1321023301020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321023301020 is an abundant number, since it is smaller than the sum of its proper divisors (2794380841284).

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

1321023301020 is a wasteful number, since it uses less digits than its factorization.

1321023301020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198351899 (or 198351894 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 1321023301020 its reverse (201033201231), we get a palindrome (1522056502251).

The spelling of 1321023301020 in words is "one trillion, three hundred twenty-one billion, twenty-three million, three hundred one thousand, twenty".