21154390350336 has 240 divisors, whose sum is σ = 61983342124704. Its totient is φ = 6944076767232.

The previous prime is 21154390350311. The next prime is 21154390350391. The reversal of 21154390350336 is 63305309345112.

21154390350336 is a `hidden beast` number, since 2 + 1 + 1 + 54 + 3 + 90 + 3 + 503 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21154390350291 and 21154390350300.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1235861650 + ... + 1235878766.

Almost surely, 2^{21154390350336} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21154390350336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30991671062352).

21154390350336 is an abundant number, since it is smaller than the sum of its proper divisors (40828951774368).

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

21154390350336 is a wasteful number, since it uses less digits than its factorization.

21154390350336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21211 (or 21192 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 45.

Adding to 21154390350336 its reverse (63305309345112), we get a palindrome (84459699695448).

The spelling of 21154390350336 in words is "twenty-one trillion, one hundred fifty-four billion, three hundred ninety million, three hundred fifty thousand, three hundred thirty-six".