21495101 has 2 divisors, whose sum is σ = 21495102. Its totient is φ = 21495100.

The previous prime is 21495083. The next prime is 21495107. The reversal of 21495101 is 10159412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 1692601 = 4450^2 + 1301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21495101 - 2²² = 17300797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21495107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10747550 + 10747551.

It is an arithmetic number, because the mean of its divisors is an integer number (10747551).

Almost surely, 2^21495101 is an apocalyptic number.

It is an amenable number.

21495101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21495101 is an equidigital number, since it uses as much as digits as its factorization.

21495101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21495101 is about 4636.2809448954. The cubic root of 21495101 is about 278.0437667235.

The spelling of 21495101 in words is "twenty-one million, four hundred ninety-five thousand, one hundred one".