21819061674 has 24 divisors (see below), whose sum is σ = 47512202400. Its totient is φ = 7236471528.

The previous prime is 21819061661. The next prime is 21819061729. The reversal of 21819061674 is 47616091812.

21819061674 is a `hidden beast` number, since 2 + 18 + 19 + 0 + 616 + 7 + 4 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3042072 + ... + 3049235.

It is an arithmetic number, because the mean of its divisors is an integer number (1979675100).

Almost surely, 2^21819061674 is an apocalyptic number.

21819061674 is an abundant number, since it is smaller than the sum of its proper divisors (25693140726).

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

21819061674 is a wasteful number, since it uses less digits than its factorization.

21819061674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091514 (or 6091511 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 21819061674 in words is "twenty-one billion, eight hundred nineteen million, sixty-one thousand, six hundred seventy-four".