21660550225350 has 96 divisors (see below), whose sum is σ = 53939861127936. Its totient is φ = 5752314960000.

The previous prime is 21660550225333. The next prime is 21660550225367. The reversal of 21660550225350 is 5352205506612.

It is an interprime number because it is at equal distance from previous prime (21660550225333) and next prime (21660550225367).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292013967 + ... + 292088133.

It is an arithmetic number, because the mean of its divisors is an integer number (561873553416).

Almost surely, 2^{21660550225350} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21660550225350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26969930563968).

21660550225350 is an abundant number, since it is smaller than the sum of its proper divisors (32279310902586).

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

21660550225350 is a wasteful number, since it uses less digits than its factorization.

21660550225350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82190 (or 82185 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 21660550225350 in words is "twenty-one trillion, six hundred sixty billion, five hundred fifty million, two hundred twenty-five thousand, three hundred fifty".