21485210 has 16 divisors (see below), whose sum is σ = 38796192. Its totient is φ = 8566800.

The previous prime is 21485203. The next prime is 21485213. The reversal of 21485210 is 1258412.

It is a super-2 number, since 2×21485210² = 923228497488200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21485213) 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, 65 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (2424762).

Almost surely, 2^21485210 is an apocalyptic number.

21485210 is a deficient number, since it is larger than the sum of its proper divisors (17310982).

21485210 is a wasteful number, since it uses less digits than its factorization.

21485210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6829.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21485210 is about 4635.2141266612. The cubic root of 21485210 is about 278.0011127744.

The spelling of 21485210 in words is "twenty-one million, four hundred eighty-five thousand, two hundred ten".