21046477 has 2 divisors, whose sum is σ = 21046478. Its totient is φ = 21046476.

The previous prime is 21046463. The next prime is 21046507. The reversal of 21046477 is 77464012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16232841 + 4813636 = 4029^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 21046477 - 2¹⁵ = 21013709 is a prime.

It is a super-2 number, since 2×21046477² = 885908388223058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21046447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523238 + 10523239.

It is an arithmetic number, because the mean of its divisors is an integer number (10523239).

Almost surely, 2^21046477 is an apocalyptic number.

It is an amenable number.

21046477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21046477 is an equidigital number, since it uses as much as digits as its factorization.

21046477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21046477 is about 4587.6439486952. The cubic root of 21046477 is about 276.0958018262.

The spelling of 21046477 in words is "twenty-one million, forty-six thousand, four hundred seventy-seven".