21168195990354 has 32 divisors (see below), whose sum is σ = 53760497754240. Its totient is φ = 6048055997136.

The previous prime is 21168195990353. The next prime is 21168195990373. The reversal of 21168195990354 is 45309959186112.

21168195990354 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 8 + 1 + 9 + 599 + 0 + 35 + 4 = 666.

It is a super-2 number, since 2×21168195990354² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 21168195990291 and 21168195990300.

It is not an unprimeable number, because it can be changed into a prime (21168195990353) 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, 28000258869 + ... + 28000259624.

It is an arithmetic number, because the mean of its divisors is an integer number (1680015554820).

Almost surely, 2^{21168195990354} is an apocalyptic number.

21168195990354 is an abundant number, since it is smaller than the sum of its proper divisors (32592301763886).

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

21168195990354 is a wasteful number, since it uses less digits than its factorization.

21168195990354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56000518511 (or 56000518505 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

The spelling of 21168195990354 in words is "twenty-one trillion, one hundred sixty-eight billion, one hundred ninety-five million, nine hundred ninety thousand, three hundred fifty-four".