21161433160 has 128 divisors (see below), whose sum is σ = 57787603200. Its totient is φ = 6812467200.

The previous prime is 21161433113. The next prime is 21161433169. The reversal of 21161433160 is 6133416112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (21161433169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 583560 + ... + 618760.

It is an arithmetic number, because the mean of its divisors is an integer number (451465650).

Almost surely, 2^21161433160 is an apocalyptic number.

21161433160 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 21161433160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28893801600).

21161433160 is an abundant number, since it is smaller than the sum of its proper divisors (36626170040).

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

21161433160 is a wasteful number, since it uses less digits than its factorization.

21161433160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35351 (or 35347 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 21161433160 its reverse (6133416112), we get a palindrome (27294849272).

The spelling of 21161433160 in words is "twenty-one billion, one hundred sixty-one million, four hundred thirty-three thousand, one hundred sixty".