21464837 has 2 divisors, whose sum is σ = 21464838. Its totient is φ = 21464836.

The previous prime is 21464831. The next prime is 21464867. The reversal of 21464837 is 73846412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 6145441 = 3914^2 + 2479^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464837 - 2⁸ = 21464581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464797 and 21464806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21464831) 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, 10732418 + 10732419.

It is an arithmetic number, because the mean of its divisors is an integer number (10732419).

Almost surely, 2^21464837 is an apocalyptic number.

It is an amenable number.

21464837 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464837 is an equidigital number, since it uses as much as digits as its factorization.

21464837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 21464837 is about 4633.0159723446. The cubic root of 21464837 is about 277.9132149788.

The spelling of 21464837 in words is "twenty-one million, four hundred sixty-four thousand, eight hundred thirty-seven".