21071461 has 2 divisors, whose sum is σ = 21071462. Its totient is φ = 21071460.

The previous prime is 21071447. The next prime is 21071467. The reversal of 21071461 is 16417012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 3682561 = 4170^2 + 1919^2 .

It is a cyclic number.

It is not a de Polignac number, because 21071461 - 2⁹ = 21070949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21071467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10535730 + 10535731.

It is an arithmetic number, because the mean of its divisors is an integer number (10535731).

Almost surely, 2^21071461 is an apocalyptic number.

It is an amenable number.

21071461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071461 is an equidigital number, since it uses as much as digits as its factorization.

21071461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21071461 is about 4590.3661074036. The cubic root of 21071461 is about 276.2050085407.

Adding to 21071461 its reverse (16417012), we get a palindrome (37488473).

The spelling of 21071461 in words is "twenty-one million, seventy-one thousand, four hundred sixty-one".