21153666255150 has 384 divisors, whose sum is σ = 62380227409920. Its totient is φ = 4676474880000.

The previous prime is 21153666255133. The next prime is 21153666255157. The reversal of 21153666255150 is 5155266635112.

It is a self number, because there is not a number n which added to its sum of digits gives 21153666255150.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153666255157) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1003055806 + ... + 1003076894.

It is an arithmetic number, because the mean of its divisors is an integer number (162448508880).

Almost surely, 2^{21153666255150} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21153666255150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31190113704960).

21153666255150 is an abundant number, since it is smaller than the sum of its proper divisors (41226561154770).

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

21153666255150 is a wasteful number, since it uses less digits than its factorization.

21153666255150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21692 (or 21687 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 48.

The spelling of 21153666255150 in words is "twenty-one trillion, one hundred fifty-three billion, six hundred sixty-six million, two hundred fifty-five thousand, one hundred fifty".