21095401 has 2 divisors, whose sum is σ = 21095402. Its totient is φ = 21095400.

The previous prime is 21095381. The next prime is 21095423. The reversal of 21095401 is 10459012.

It is an a-pointer prime, because the next prime (21095423) can be obtained adding 21095401 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19149376 + 1946025 = 4376^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21095401 - 2¹⁵ = 21062633 is a prime.

It is not a weakly prime, because it can be changed into another prime (21095461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547700 + 10547701.

It is an arithmetic number, because the mean of its divisors is an integer number (10547701).

Almost surely, 2^21095401 is an apocalyptic number.

It is an amenable number.

21095401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095401 is an equidigital number, since it uses as much as digits as its factorization.

21095401 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 22.

The square root of 21095401 is about 4592.9730023156. The cubic root of 21095401 is about 276.3095709045.

The spelling of 21095401 in words is "twenty-one million, ninety-five thousand, four hundred one".