21010700 has 36 divisors (see below), whose sum is σ = 45908520. Its totient is φ = 8346240.

The previous prime is 21010699. The next prime is 21010711. The reversal of 21010700 is 701012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15656 + ... + 16944.

Almost surely, 2^21010700 is an apocalyptic number.

21010700 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 21010700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22954260).

21010700 is an abundant number, since it is smaller than the sum of its proper divisors (24897820).

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

21010700 is a wasteful number, since it uses less digits than its factorization.

21010700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 21010700 is about 4583.7430119936. The cubic root of 21010700 is about 275.9392676005.

Adding to 21010700 its reverse (701012), we get a palindrome (21711712).

The spelling of 21010700 in words is "twenty-one million, ten thousand, seven hundred".