21215014 has 24 divisors (see below), whose sum is σ = 34450920. Its totient is φ = 9763776.

The previous prime is 21215009. The next prime is 21215017. The reversal of 21215014 is 41051212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215017) 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 11 ways as a sum of consecutive naturals, for example, 152557 + ... + 152695.

It is an arithmetic number, because the mean of its divisors is an integer number (1435455).

Almost surely, 2^21215014 is an apocalyptic number.

21215014 is a deficient number, since it is larger than the sum of its proper divisors (13235906).

21215014 is a wasteful number, since it uses less digits than its factorization.

21215014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 225 counting only the distinct ones).

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

The square root of 21215014 is about 4605.9759009357. The cubic root of 21215014 is about 276.8308211167.

Adding to 21215014 its reverse (41051212), we get a palindrome (62266226).

The spelling of 21215014 in words is "twenty-one million, two hundred fifteen thousand, fourteen".