1320021421040 has 80 divisors (see below), whose sum is σ = 3546895573440. Its totient is φ = 447493601280.

The previous prime is 1320021420997. The next prime is 1320021421067. The reversal of 1320021421040 is 401241200231.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13192751 + ... + 13292430.

It is an arithmetic number, because the mean of its divisors is an integer number (44336194668).

Almost surely, 2^{1320021421040} is an apocalyptic number.

1320021421040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320021421040 is an abundant number, since it is smaller than the sum of its proper divisors (2226874152400).

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

1320021421040 is a wasteful number, since it uses less digits than its factorization.

1320021421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26485290 (or 26485284 counting only the distinct ones).

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

Adding to 1320021421040 its reverse (401241200231), we get a palindrome (1721262621271).

The spelling of 1320021421040 in words is "one trillion, three hundred twenty billion, twenty-one million, four hundred twenty-one thousand, forty".