21140210 has 48 divisors (see below), whose sum is σ = 47117376. Its totient is φ = 6686784.

The previous prime is 21140201. The next prime is 21140213. The reversal of 21140210 is 1204112.

It is a junction number, because it is equal to n+sod(n) for n = 21140191 and 21140200.

It is not an unprimeable number, because it can be changed into a prime (21140213) 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 23 ways as a sum of consecutive naturals, for example, 10937 + ... + 12723.

It is an arithmetic number, because the mean of its divisors is an integer number (981612).

Almost surely, 2^21140210 is an apocalyptic number.

21140210 is an abundant number, since it is smaller than the sum of its proper divisors (25977166).

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

21140210 is a wasteful number, since it uses less digits than its factorization.

21140210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21140210 is about 4597.8484098543. The cubic root of 21140210 is about 276.5050700652.

Adding to 21140210 its reverse (1204112), we get a palindrome (22344322).

The spelling of 21140210 in words is "twenty-one million, one hundred forty thousand, two hundred ten".