21466037 has 2 divisors, whose sum is σ = 21466038. Its totient is φ = 21466036.

The previous prime is 21466021. The next prime is 21466079. The reversal of 21466037 is 73066412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 361201 = 4594^2 + 601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21466037 - 2⁴ = 21466021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21466097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733018 + 10733019.

It is an arithmetic number, because the mean of its divisors is an integer number (10733019).

Almost surely, 2^21466037 is an apocalyptic number.

It is an amenable number.

21466037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21466037 is an equidigital number, since it uses as much as digits as its factorization.

21466037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 21466037 is about 4633.1454758080. The cubic root of 21466037 is about 277.9183938308.

The spelling of 21466037 in words is "twenty-one million, four hundred sixty-six thousand, thirty-seven".