21214510 has 16 divisors (see below), whose sum is σ = 39846816. Its totient is φ = 8116768.

The previous prime is 21214493. The next prime is 21214517. The reversal of 21214510 is 1541212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45889 + ... + 46348.

It is an arithmetic number, because the mean of its divisors is an integer number (2490426).

Almost surely, 2^21214510 is an apocalyptic number.

21214510 is a deficient number, since it is larger than the sum of its proper divisors (18632306).

21214510 is a wasteful number, since it uses less digits than its factorization.

21214510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92267.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21214510 is about 4605.9211890782. The cubic root of 21214510 is about 276.8286288982.

Adding to 21214510 its reverse (1541212), we get a palindrome (22755722).

The spelling of 21214510 in words is "twenty-one million, two hundred fourteen thousand, five hundred ten".