21031160 has 32 divisors (see below), whose sum is σ = 47466000. Its totient is φ = 8386560.

The previous prime is 21031151. The next prime is 21031163. The reversal of 21031160 is 6113012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17375 + ... + 18545.

Almost surely, 2^21031160 is an apocalyptic number.

21031160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031160 is an abundant number, since it is smaller than the sum of its proper divisors (26434840).

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

21031160 is a wasteful number, since it uses less digits than its factorization.

21031160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21031160 is about 4585.9742694437. The cubic root of 21031160 is about 276.0288074671.

Adding to 21031160 its reverse (6113012), we get a palindrome (27144172).

The spelling of 21031160 in words is "twenty-one million, thirty-one thousand, one hundred sixty".