21416013 has 24 divisors (see below), whose sum is σ = 32480448. Its totient is φ = 13571712.

The previous prime is 21415991. The next prime is 21416023. The reversal of 21416013 is 31061412.

It is a happy number.

21416013 is a `hidden beast` number, since 21 + 41 + 601 + 3 = 666.

It is not a de Polignac number, because 21416013 - 2¹³ = 21407821 is a prime.

It is a super-2 number, since 2×21416013² = 917291225632338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416023) 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 in 23 ways as a sum of consecutive naturals, for example, 63381 + ... + 63717.

It is an arithmetic number, because the mean of its divisors is an integer number (1353352).

Almost surely, 2^21416013 is an apocalyptic number.

21416013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21416013 is a deficient number, since it is larger than the sum of its proper divisors (11064435).

21416013 is a wasteful number, since it uses less digits than its factorization.

21416013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21416013 is about 4627.7438347428. The cubic root of 21416013 is about 277.7023408604.

Adding to 21416013 its reverse (31061412), we get a palindrome (52477425).

The spelling of 21416013 in words is "twenty-one million, four hundred sixteen thousand, thirteen".