21014407 has 2 divisors, whose sum is σ = 21014408. Its totient is φ = 21014406.

The previous prime is 21014381. The next prime is 21014429. The reversal of 21014407 is 70441012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21014407 - 2¹¹ = 21012359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21017407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507203 + 10507204.

It is an arithmetic number, because the mean of its divisors is an integer number (10507204).

Almost surely, 2^21014407 is an apocalyptic number.

21014407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014407 is an equidigital number, since it uses as much as digits as its factorization.

21014407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21014407 is about 4584.1473580154. The cubic root of 21014407 is about 275.9554949944.

Adding to 21014407 its reverse (70441012), we get a palindrome (91455419).

The spelling of 21014407 in words is "twenty-one million, fourteen thousand, four hundred seven".