21154005400050 has 36 divisors (see below), whose sum is σ = 56833761176010. Its totient is φ = 5641068106560.

The previous prime is 21154005399929. The next prime is 21154005400067. The reversal of 21154005400050 is 5000450045112.

21154005400050 is a `hidden beast` number, since 2 + 115 + 4 + 0 + 0 + 540 + 0 + 0 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 19914361427601 + 1239643972449 = 4462551^2 + 1113393^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21154005399987 and 21154005400023.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23504449995 + ... + 23504450894.

Almost surely, 2^{21154005400050} is an apocalyptic number.

21154005400050 is an abundant number, since it is smaller than the sum of its proper divisors (35679755775960).

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

21154005400050 is a wasteful number, since it uses less digits than its factorization.

21154005400050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47008900907 (or 47008900899 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 21154005400050 its reverse (5000450045112), we get a palindrome (26154455445162).

The spelling of 21154005400050 in words is "twenty-one trillion, one hundred fifty-four billion, five million, four hundred thousand, fifty".