21666061302 has 16 divisors (see below), whose sum is σ = 44066566080. Its totient is φ = 7099613192.

The previous prime is 21666061297. The next prime is 21666061309. The reversal of 21666061302 is 20316066612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666061309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30601428 + ... + 30602135.

It is an arithmetic number, because the mean of its divisors is an integer number (2754160380).

Almost surely, 2^21666061302 is an apocalyptic number.

21666061302 is an abundant number, since it is smaller than the sum of its proper divisors (22400504778).

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

21666061302 is a wasteful number, since it uses less digits than its factorization.

21666061302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61203627.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 21666061302 in words is "twenty-one billion, six hundred sixty-six million, sixty-one thousand, three hundred two".