1321001420420 has 24 divisors (see below), whose sum is σ = 3026294163648. Its totient is φ = 480364152800.

The previous prime is 1321001420363. The next prime is 1321001420423. The reversal of 1321001420420 is 240241001231.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1321001420392 and 1321001420401.

It is not an unprimeable number, because it can be changed into a prime (1321001420423) 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, 3002275736 + ... + 3002276175.

It is an arithmetic number, because the mean of its divisors is an integer number (126095590152).

Almost surely, 2^{1321001420420} is an apocalyptic number.

1321001420420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321001420420 is an abundant number, since it is smaller than the sum of its proper divisors (1705292743228).

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

1321001420420 is a wasteful number, since it uses less digits than its factorization.

1321001420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6004551931 (or 6004551929 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1321001420420 its reverse (240241001231), we get a palindrome (1561242421651).

The spelling of 1321001420420 in words is "one trillion, three hundred twenty-one billion, one million, four hundred twenty thousand, four hundred twenty".