21010760 has 32 divisors (see below), whose sum is σ = 47451960. Its totient is φ = 8372736.

The previous prime is 21010757. The next prime is 21010763. The reversal of 21010760 is 6701012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010757) and next prime (21010763).

It can be written as a sum of positive squares in 4 ways, for example, as 9572836 + 11437924 = 3094^2 + 3382^2 .

It is not an unprimeable number, because it can be changed into a prime (21010763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11852 + ... + 13508.

Almost surely, 2^21010760 is an apocalyptic number.

21010760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010760 is an abundant number, since it is smaller than the sum of its proper divisors (26441200).

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

21010760 is a wasteful number, since it uses less digits than its factorization.

21010760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21010760 is about 4583.7495568584. The cubic root of 21010760 is about 275.9395302657.

Adding to 21010760 its reverse (6701012), we get a palindrome (27711772).

The spelling of 21010760 in words is "twenty-one million, ten thousand, seven hundred sixty".