21312014 has 4 divisors (see below), whose sum is σ = 31968024. Its totient is φ = 10656006.

The previous prime is 21312001. The next prime is 21312017. The reversal of 21312014 is 41021312.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21312014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328002 + ... + 5328005.

It is an arithmetic number, because the mean of its divisors is an integer number (7992006).

Almost surely, 2^21312014 is an apocalyptic number.

21312014 is a deficient number, since it is larger than the sum of its proper divisors (10656010).

21312014 is a wasteful number, since it uses less digits than its factorization.

21312014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656009.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21312014 is about 4616.4936911037. The cubic root of 21312014 is about 277.2520914467.

Adding to 21312014 its reverse (41021312), we get a palindrome (62333326).

The spelling of 21312014 in words is "twenty-one million, three hundred twelve thousand, fourteen".