1321421040 has 200 divisors, whose sum is σ = 4666123968. Its totient is φ = 346498560.

The previous prime is 1321421039. The next prime is 1321421051. The reversal of 1321421040 is 401241231.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 393609 + ... + 396951.

Almost surely, 2^1321421040 is an apocalyptic number.

1321421040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2333061984).

1321421040 is an abundant number, since it is smaller than the sum of its proper divisors (3344702928).

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

1321421040 is a wasteful number, since it uses less digits than its factorization.

1321421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429 (or 3414 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1321421040 is about 36351.3554080175. The cubic root of 1321421040 is about 1097.3548122170.

Adding to 1321421040 its reverse (401241231), we get a palindrome (1722662271).

The spelling of 1321421040 in words is "one billion, three hundred twenty-one million, four hundred twenty-one thousand, forty".