21358566160 has 80 divisors (see below), whose sum is σ = 50433986304. Its totient is φ = 8411014656.

The previous prime is 21358566157. The next prime is 21358566161. The reversal of 21358566160 is 6166585312.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21358566160² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21358566161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1418029 + ... + 1433011.

Almost surely, 2^21358566160 is an apocalyptic number.

21358566160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21358566160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25216993152).

21358566160 is an abundant number, since it is smaller than the sum of its proper divisors (29075420144).

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

21358566160 is a wasteful number, since it uses less digits than its factorization.

21358566160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15272 (or 15266 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21358566160 in words is "twenty-one billion, three hundred fifty-eight million, five hundred sixty-six thousand, one hundred sixty".