21095461 has 2 divisors, whose sum is σ = 21095462. Its totient is φ = 21095460.

The previous prime is 21095429. The next prime is 21095483. The reversal of 21095461 is 16459012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 164836 = 4575^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 21095461 - 2⁵ = 21095429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547730 + 10547731.

It is an arithmetic number, because the mean of its divisors is an integer number (10547731).

Almost surely, 2^21095461 is an apocalyptic number.

It is an amenable number.

21095461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095461 is an equidigital number, since it uses as much as digits as its factorization.

21095461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21095461 is about 4592.9795340280. The cubic root of 21095461 is about 276.3098328661.

The spelling of 21095461 in words is "twenty-one million, ninety-five thousand, four hundred sixty-one".