1099565989621 has 16 divisors (see below), whose sum is σ = 1227265128576. Its totient is φ = 976707000000.

The previous prime is 1099565989589. The next prime is 1099565989663. The reversal of 1099565989621 is 1269895659901.

It is a cyclic number.

It is not a de Polignac number, because 1099565989621 - 2⁵ = 1099565989589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099565989421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5324830 + ... + 5527471.

It is an arithmetic number, because the mean of its divisors is an integer number (76704070536).

Almost surely, 2^{1099565989621} is an apocalyptic number.

1099565989621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1099565989621 is a deficient number, since it is larger than the sum of its proper divisors (127699138955).

1099565989621 is a wasteful number, since it uses less digits than its factorization.

1099565989621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10852524.

The product of its (nonzero) digits is 94478400, while the sum is 70.

The spelling of 1099565989621 in words is "one trillion, ninety-nine billion, five hundred sixty-five million, nine hundred eighty-nine thousand, six hundred twenty-one".