1621543516332 has 24 divisors (see below), whose sum is σ = 3783627918000. Its totient is φ = 540510736896.

The previous prime is 1621543516297. The next prime is 1621543516337. The reversal of 1621543516332 is 2336153451261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1621543516337) 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, 1735044 + ... + 2500692.

It is an arithmetic number, because the mean of its divisors is an integer number (157651163250).

Almost surely, 2^{1621543516332} is an apocalyptic number.

1621543516332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621543516332 is an abundant number, since it is smaller than the sum of its proper divisors (2162084401668).

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

1621543516332 is a wasteful number, since it uses less digits than its factorization.

1621543516332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942145 (or 942143 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

Adding to 1621543516332 its reverse (2336153451261), we get a palindrome (3957696967593).

The spelling of 1621543516332 in words is "one trillion, six hundred twenty-one billion, five hundred forty-three million, five hundred sixteen thousand, three hundred thirty-two".