1621603921392 has 320 divisors, whose sum is σ = 5751601873920. Its totient is φ = 425969280000.

The previous prime is 1621603921361. The next prime is 1621603921501. The reversal of 1621603921392 is 2931293061261.

1621603921392 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 603 + 9 + 2 + 1 + 39 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9785142 + ... + 9949482.

It is an arithmetic number, because the mean of its divisors is an integer number (17973755856).

Almost surely, 2^{1621603921392} is an apocalyptic number.

1621603921392 is a gapful number since it is divisible by the number (12) 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 1621603921392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2875800936960).

1621603921392 is an abundant number, since it is smaller than the sum of its proper divisors (4129997952528).

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

1621603921392 is a wasteful number, since it uses less digits than its factorization.

1621603921392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164629 (or 164617 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 1621603921392 in words is "one trillion, six hundred twenty-one billion, six hundred three million, nine hundred twenty-one thousand, three hundred ninety-two".