21420014 has 16 divisors (see below), whose sum is σ = 40058496. Its totient is φ = 8345400.

The previous prime is 21420013. The next prime is 21420023. The reversal of 21420014 is 41002412.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420013) 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, 69392 + ... + 69699.

It is an arithmetic number, because the mean of its divisors is an integer number (2503656).

Almost surely, 2^21420014 is an apocalyptic number.

21420014 is a deficient number, since it is larger than the sum of its proper divisors (18638482).

21420014 is a wasteful number, since it uses less digits than its factorization.

21420014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139111.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21420014 is about 4628.1760986376. The cubic root of 21420014 is about 277.7196334953.

Adding to 21420014 its reverse (41002412), we get a palindrome (62422426).

The spelling of 21420014 in words is "twenty-one million, four hundred twenty thousand, fourteen".