21895802 has 8 divisors (see below), whose sum is σ = 32969376. Its totient is φ = 10906012.

The previous prime is 21895799. The next prime is 21895807. The reversal of 21895802 is 20859812.

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

It is a super-2 number, since 2×21895802² = 958852290446408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21895807) 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 3 ways as a sum of consecutive naturals, for example, 20288 + ... + 21339.

It is an arithmetic number, because the mean of its divisors is an integer number (4121172).

Almost surely, 2^21895802 is an apocalyptic number.

21895802 is a deficient number, since it is larger than the sum of its proper divisors (11073574).

21895802 is a wasteful number, since it uses less digits than its factorization.

21895802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41892.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21895802 is about 4679.2950323740. The cubic root of 21895802 is about 279.7608587385.

The spelling of 21895802 in words is "twenty-one million, eight hundred ninety-five thousand, eight hundred two".