21066604542630 has 128 divisors (see below), whose sum is σ = 57104887910400. Its totient is φ = 5525054064000.

The previous prime is 21066604542593. The next prime is 21066604542647. The reversal of 21066604542630 is 3624540666012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 159347055 + ... + 159479205.

It is an arithmetic number, because the mean of its divisors is an integer number (446131936800).

Almost surely, 2^{21066604542630} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21066604542630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28552443955200).

21066604542630 is an abundant number, since it is smaller than the sum of its proper divisors (36038283367770).

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

21066604542630 is a wasteful number, since it uses less digits than its factorization.

21066604542630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141907 (or 141901 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 21066604542630 in words is "twenty-one trillion, sixty-six billion, six hundred four million, five hundred forty-two thousand, six hundred thirty".