21995602 has 8 divisors (see below), whose sum is σ = 33122556. Its totient is φ = 10954752.

The previous prime is 21995599. The next prime is 21995621. The reversal of 21995602 is 20659912.

It can be written as a sum of positive squares in 2 ways, for example, as 19527561 + 2468041 = 4419^2 + 1571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20883 + ... + 21910.

Almost surely, 2^21995602 is an apocalyptic number.

21995602 is a deficient number, since it is larger than the sum of its proper divisors (11126954).

21995602 is a wasteful number, since it uses less digits than its factorization.

21995602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43052.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 21995602 is about 4689.9469080151. The cubic root of 21995602 is about 280.1852600500.

The spelling of 21995602 in words is "twenty-one million, nine hundred ninety-five thousand, six hundred two".