1621632320000 has 1200 divisors, whose sum is σ = 5277399891456. Its totient is φ = 486604800000.

The previous prime is 1621632319991. The next prime is 1621632320059. The reversal of 1621632320000 is 232361261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8402239904 + ... + 8402240096.

Almost surely, 2^{1621632320000} is an apocalyptic number.

1621632320000 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 1621632320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638699945728).

1621632320000 is an abundant number, since it is smaller than the sum of its proper divisors (3655767571456).

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

1621632320000 is an equidigital number, since it uses as much as digits as its factorization.

1621632320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 1621632320000 its reverse (232361261), we get a palindrome (1621864681261).

The spelling of 1621632320000 in words is "one trillion, six hundred twenty-one billion, six hundred thirty-two million, three hundred twenty thousand".