1993216294421 has 16 divisors (see below), whose sum is σ = 2288923425600. Its totient is φ = 1716598656000.

The previous prime is 1993216294417. The next prime is 1993216294477. The reversal of 1993216294421 is 1244926123991.

It is a cyclic number.

It is not a de Polignac number, because 1993216294421 - 2² = 1993216294417 is a prime.

It is a super-2 number, since 2×1993216294421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993216294021) 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, 9081071 + ... + 9297971.

It is an arithmetic number, because the mean of its divisors is an integer number (143057714100).

Almost surely, 2^{1993216294421} is an apocalyptic number.

1993216294421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1993216294421 is a deficient number, since it is larger than the sum of its proper divisors (295707131179).

1993216294421 is a wasteful number, since it uses less digits than its factorization.

1993216294421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260900.

The product of its digits is 1679616, while the sum is 53.

The spelling of 1993216294421 in words is "one trillion, nine hundred ninety-three billion, two hundred sixteen million, two hundred ninety-four thousand, four hundred twenty-one".