21152154223650 has 192 divisors, whose sum is σ = 52969592407680. Its totient is φ = 5585807462400.

The previous prime is 21152154223633. The next prime is 21152154223679. The reversal of 21152154223650 is 5632245125112.

It is a junction number, because it is equal to n+sod(n) for n = 21152154223599 and 21152154223608.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8751407242 + ... + 8751409658.

It is an arithmetic number, because the mean of its divisors is an integer number (275883293790).

Almost surely, 2^{21152154223650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21152154223650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26484796203840).

21152154223650 is an abundant number, since it is smaller than the sum of its proper divisors (31817438184030).

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

21152154223650 is a wasteful number, since it uses less digits than its factorization.

21152154223650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3824 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

Adding to 21152154223650 its reverse (5632245125112), we get a palindrome (26784399348762).

The spelling of 21152154223650 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-four million, two hundred twenty-three thousand, six hundred fifty".