21053210 has 16 divisors (see below), whose sum is σ = 37953792. Its totient is φ = 8408400.

The previous prime is 21053203. The next prime is 21053267. The reversal of 21053210 is 1235012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7955 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (2372112).

Almost surely, 2^21053210 is an apocalyptic number.

21053210 is a deficient number, since it is larger than the sum of its proper divisors (16900582).

21053210 is a wasteful number, since it uses less digits than its factorization.

21053210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21053210 is about 4588.3777089512. The cubic root of 21053210 is about 276.1252407174.

Adding to 21053210 its reverse (1235012), we get a palindrome (22288222).

The spelling of 21053210 in words is "twenty-one million, fifty-three thousand, two hundred ten".