21519168954 has 8 divisors (see below), whose sum is σ = 43038337920. Its totient is φ = 7173056316.

The previous prime is 21519168917. The next prime is 21519169027. The reversal of 21519168954 is 45986191512.

It is a sphenic number, since it is the product of 3 distinct primes.

21519168954 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21519168897 and 21519168906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793264074 + ... + 1793264085.

It is an arithmetic number, because the mean of its divisors is an integer number (5379792240).

Almost surely, 2^21519168954 is an apocalyptic number.

21519168954 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21519168954 is a wasteful number, since it uses less digits than its factorization.

21519168954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586528164.

The product of its digits is 777600, while the sum is 51.

The spelling of 21519168954 in words is "twenty-one billion, five hundred nineteen million, one hundred sixty-eight thousand, nine hundred fifty-four".