21361366760 has 16 divisors (see below), whose sum is σ = 48063075300. Its totient is φ = 8544546688.

The previous prime is 21361366751. The next prime is 21361366787. The reversal of 21361366760 is 6766316312.

It can be written as a sum of positive squares in 2 ways, for example, as 21327097444 + 34269316 = 146038^2 + 5854^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267017045 + ... + 267017124.

Almost surely, 2^21361366760 is an apocalyptic number.

21361366760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21361366760 is an abundant number, since it is smaller than the sum of its proper divisors (26701708540).

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

21361366760 is a wasteful number, since it uses less digits than its factorization.

21361366760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534034180 (or 534034176 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 41.

The spelling of 21361366760 in words is "twenty-one billion, three hundred sixty-one million, three hundred sixty-six thousand, seven hundred sixty".