21095402 has 32 divisors (see below), whose sum is σ = 35335440. Its totient is φ = 9400320.

The previous prime is 21095401. The next prime is 21095423. The reversal of 21095402 is 20459012.

It can be written as a sum of positive squares in 8 ways, for example, as 17131321 + 3964081 = 4139^2 + 1991^2 .

It is a super-3 number, since 3×21095402³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21095401) 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 in 15 ways as a sum of consecutive naturals, for example, 51374 + ... + 51782.

Almost surely, 2^21095402 is an apocalyptic number.

21095402 is a deficient number, since it is larger than the sum of its proper divisors (14240038).

21095402 is a wasteful number, since it uses less digits than its factorization.

21095402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21095402 is about 4592.9731111776. The cubic root of 21095402 is about 276.3095752705.

The spelling of 21095402 in words is "twenty-one million, ninety-five thousand, four hundred two".