21200010 has 64 divisors (see below), whose sum is σ = 57697920. Its totient is φ = 4942080.

The previous prime is 21199999. The next prime is 21200021. The reversal of 21200010 is 1000212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21199999) and next prime (21200021).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5980 + ... + 8840.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^21200010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28848960).

21200010 is an abundant number, since it is smaller than the sum of its proper divisors (36497910).

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

21200010 is a wasteful number, since it uses less digits than its factorization.

21200010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 21200010 is about 4604.3468592190. The cubic root of 21200010 is about 276.7655442455.

Adding to 21200010 its reverse (1000212), we get a palindrome (22200222).

The spelling of 21200010 in words is "twenty-one million, two hundred thousand, ten".