21015160 has 16 divisors (see below), whose sum is σ = 47284200. Its totient is φ = 8406048.

The previous prime is 21015143. The next prime is 21015161. The reversal of 21015160 is 6151012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21015161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262650 + ... + 262729.

Almost surely, 2^21015160 is an apocalyptic number.

21015160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21015160 is an abundant number, since it is smaller than the sum of its proper divisors (26269040).

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

21015160 is a wasteful number, since it uses less digits than its factorization.

21015160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525390 (or 525386 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21015160 is about 4584.2294881474. The cubic root of 21015160 is about 275.9587910189.

Adding to 21015160 its reverse (6151012), we get a palindrome (27166172).

The spelling of 21015160 in words is "twenty-one million, fifteen thousand, one hundred sixty".